Principles of Inheritance and Variation · Biology · NEET

A human female with Turner’s syndrome :

Fruit colour in squash is an example of :

A man whose father was colour blind marries a women who had a colour blind mother and normal father. What percentage of male children of this couple w...

A gene showing codominance has :

A colour blind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their grandson b...

A pleiotropic gene -

In his classic experiments on pea plants, Mendel did not use :

The term "linkage" was coined by -

In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree. ...

Given below are two statements: Statement I: When many alleles of a single gene govern a character, it is called polygenic inheritance. Statement II: ...

Match List-I with List-II: .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-famil...

When a tall pea plant with round seeds was selfed, it produced the progeny of : (a) Tall plants with round seeds and (b) Tall plants with wrinkled see...

Aneuploidy is a chromosomal disorder where chromosome number is not the exact copy of its haploid set of chromosomes, due to : A. Substitution B. Addi...

The mother has $$\mathrm{A}+$$ blood group the father has $$\mathrm{B}+$$ and the child is $$\mathrm{A}+$$. What can be the possibility of genotypes o...

Which one of the following can be explained on the basis of Mendel's Law of Dominance? A. Out of one pair of factors one is dominant and the other is ...

A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?

In a plant, black seed color $$(\mathrm{BB} / \mathrm{Bb})$$ is dominant over white seed color $$(\mathrm{bb})$$. In order to find out the genotype of...

Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family...

As per ABO blood grouping system, the blood group of father is $$\mathrm{B}^{+}$$, mother is $$\mathrm{A}^{+}$$ and child is $$\mathrm{O}^{+}$$. Their...

Match List - I with List - II. .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-f...

A heterozygous pea plant with violet flowers was crossed with homozygous pea plant with white flower. Violet is dominant over white. Which one of the ...

In which disorder change of single base pair in the gene for beta globin chain results in change of glutamic acid to valine ?

A certain plant homozygous for yellow seeds and red flowers was crossed with a plant homozygous for green seeds and white flowers. The F1 plants had...

Select the correct statement/s with respect to mechanism of sex determination in Grasshopper. (A) It is an example of female heterogamety. (B) Ma...

Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was ...

The phenomenon of pleiotropism refers to

Which of the following statements are correct about Klinefelter’s Syndrome? A. This disorder was first described by Langdon Down (1866). B. Such an in...

Broad palm with single palm crease is visible in a person suffering from-

Which one of the following symbols represents mating between relatives in human pedigree analysis?

Given below are two statements: Statement I : Sickle cell anaemia and haemophilia are autosomal dominant traits. Statement II : Sickle cell anaemia an...

In meiosis, crossing over and exchange of genetic material between homologous chromosomes are catalyzed by the enzyme

The chromosomal theory of inheritance was proposed by

What is the expected percentage of F2 progeny with yellow and inflated pod in dihybrid cross experiment involving pea plants with green coloured, infl...

If a female individual is with small round head, furrowed tongue, partially open mouth and broad palm with characteristic palm crease. Also the physic...

Select the incorrect match regarding the symbols used in the Pedigree analysis:

A normal girl, whose mother is haemophilic marries a male with no ancestral history of haemophilia. What will be the possible phenotypes of the offspr...

XO type of sex determination can be found in :

Given below are two statements: Statement I : Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inheritance. Sta...

Which of the following occurs due to the presence of autosome linked dominant trait?

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Mendel's law of independent...

If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness?

The recombination frequency between the genes a & c 5&, b & c is 15%, b & d is 9%, a & b is 20%, c & d is 25% and a & d is 29%. What will be the seque...

The production of gametes by the parents, formation of zygotes, the F1 and F2 plants, can be understood from a diagram called :

Now-a-days it is possible to detect the mutated gene causing cancer by allowing radioactive probe to hybridise its complimentary DNA in a clone of cel...

In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?

Experimental verification of the chromosomal theory of inheritance was done by

Select the correct match

How many true breeding pea plant varieties did Mendel select as pairs, which were similar except in one character with contrasting traits?

In Antirrhinum (Snapdragon), a red flower was crossed with a white flower and in F1 generation, pink flowers were obtained. When pink flowers were sel...

The frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by :

What is the genetic disorder in which an individual has an overall masculine development, gynaecomastia, and is sterile?

What map unit (Centimorgan) is adopted in the construction of genetic maps?

A gene locus has two alleles A, a. If the frequency of dominant allele A is 0.4, then what will be the frequency of homozygous dominant, heterozygous ...

Select the incorrect statement.

Which of the following characteristics represent 'Inheritance of blood groups' in humans? a. Dominance b. Co-dominance c. Multiple allele d. Incom...

Which of the following pairs is wrongly matched?

A woman has an X-linked condition on one of her X chromosomes. This chromosome can be inherited by

The genotypes of a Husband and Wife are IAIB and IAi. Among the blood types of their children, how many different genotypes and phenotypes are possibl...

Which one from those given below is the period for Mendel’s hybridisation experiments ?

A disease caused by an autosomal primary non-disjunction is :

Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement.

Among the following characters, which one was not considered by Mendel in his experiments on pea?

If a colour-blind man marries a woman who is homozygous for normal colour vision, the probability of their son being colour-blind is

The mechanism that causes a gene to move from one linkage group to another is called

Pick out the correct statements : (a) Haemophilia is a sex-linked recessive disease. (b) Down's syndrome is due to aneuploidy. (c) Phenylketonuria is ...

A cell at telophase stage is observed by a student in a plant brought from the field. He tells his teacher that this cell is not like other cells at t...

Match the terms in Column-I with their description in Column-II and choose the correct option : .tg {border-collapse:collapse;border-spacing:0;width...

Which of the following most appropriately describes haemophilia ?

In a testcross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-typeoffspring. This indicates

A tall true breeding garden pea plant is crossed with a dwarf true breeding garden pea plant. When the F1 plants were selfed the resulting genotypes w...

Multiple alleles are present

How many pairs of contrasting characters in pea plants were studied by Mendel in his experiments?

A man with blood group ‘A’ marries a woman with blood group ‘B’. What are all the possible blood groups of their offsprings?

Alleles are

The movement of a gene from one linkage group to another is called

An abnormal human baby with ‘XXX’ sex chromosomes was born due to

Down's syndrome in humans is due to :

Which one is the incorrect statement with regards to the importance of pedigree analysis?

If two persons with 'AB' blood group marry and have sufficiently large number of children, these children could be classified as 'A' blood group : 'AB...

Select the incorrect statement with regard to Haemophilia is :

Which idea is depicted by a cross in which the F1 generation resembles both the parents?

Which of the following cannot be detected in a developing foetus by amniocentesis ?

If both parents are carriers for thalessemia, which is an autosomal recessive disorder, what are the chances of pregnancy resulting in an affected chi...

A test cross is carried out to :

Represented below is the inheritance pattern of the certain type of traits in humans. Which one of the following conditions could be an example of thi...

Which one of the following is a wrong statement regarding mutations ?

F2 generation in a Mendelian cross showed that both genotypic and phenotypic ratios are same as 1 : 2 : 1. It represents a case of

A normal - visioned man whose father was colour bilind, marries a woman whose father was also colour - blind. They have their first child as a daughte...

Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child ?

Test cross in plants or in Drosophila involves crossing :

Mutations can be induced with :

Which one of the following conditions correctly describes the manner of determining the sex ?

When two unrelated individuals or lines are crossed, the per romance of F1 hybrid is often superior to both parents. This phenomenon is called :

Study the pedigree chart of a certain family given below and select the correct conculusion which can be drawn for the character – ...

In antirrhinum two plants with pink flowers were hybridized. The F1 plants produced red, pink and white flowers in the proportion of 1 red, 2 pink and...

A cross in which an organism showing a dominant phenotype in crossed with the recessive parent in order to know its genotype is called -

ABO blood grouping is controlled by gene I which has three alleles and show co-dominance. There are six genotypes. How many phenotypes in all are poss...

ABO blood groups in humans are controlled by the gene I. It has three alleles – IA, IB and i. Since there are three different alleles, six different ...

Select the correct statement from the ones given below with respect to dihybrid cross –

Which one of the following symbols and its representation, used in human pedigree analysis is correct –

The genotype of a plant showing the dominant phenotype can be determined by –

Which one of the following cannot be explained on the basis of Mendel's Law of Dominance?

Study the pedigree chart given below : What does it show ? ...

The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because "O" in it refers to having :

The genetic defect-adenosine deaminase (ADA) deficiency may be cured permanently by

Sickle-cell anemia is :

Select the incorrect statement from the following :

Which one of the following conditions in humans is correctly matched with its chromosomal abnormality/linkage?

Haploids are more suitable for mutation studies than the diploids. This is because:

Inheritance of skin colour in humans is an example of:-

In the hexaploid wheat, the haploid(n) and basic(x) numbers of chromosomes are :

A common test to find the genotype of a hybrid is by:-

In pea plants, yellow seeds are dominant to green. If a heterozygous yellow seeded plant is crossed with a green seeded plant, what ratio of yellow an...

A human male produces sperms with the genotypes AB, Ab, AB, and ab pertaining to two diallelic characters in equal proportions. What is the correspond...

Phenotype of an organism is the result of-

Which one of the following is an example of polygenic inheritance ?

How many different kinds of gametes will be produced by a plant having the genotype AABbCC ?

Sickle cell anaemia has not been eliminated from the African population because-

In Mendel's experiments with garden pea, round seed shape (RR) was dominant over wrinkled seeds (rr), yellow cotyledon (YY) was dominant over green co...

Cri-du-chat syndrome in humans is caused by the-

If a colour blind woman marries a normal visioned man, their sons will be

Both sickle cell anemia and Huntington's chorea are-

Test cross involves-

G-6-P dehydrogenase deficiency is associated with haemolysis of -

A women with 47 chromosomes due to three copies of chromosome 21 is characterized by

A man and a woman, who do not show any apparent signs of a certain inherited disease, have seven children (2 daughter and 5 sons). Three of the sons s...

In order to find out the different types of gametes produced by a pea plants having the genotype AaBb, it should be crossed to a plant with the genoty...

A women with 47 chromosomes due to three copies of chromosome 21 is characterized by -

Haemophilia is more commonly seen in human males than in human females because -

A woman with normal vision, but whose father was colour bind, marries a colour blind man. Suppose that the fourth child of this couple was a boy. This...

Which of the following is not a hereditary disease ?

In a plant, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over shortness (t). If a plant with RRTt genotype is crossed ...

One of the parents of a cross has a mutation in its mitochondria. In that cross, that parent is taken as a male. During segregation of F2 progenies th...

Lack of independent assortment of two genes A and B in fruit fly Drosophila is due to :-

A male human is heterozygous for autosomal genes A and B and is also hemizygous for hemophilic gene h. What proportion of his sperms will be abh :-

A normal woman, whose father was colour-blind is married to a normal man. The sons would be :-

The recessive genes located on X-chromosomes in humans are always-

The genes controlling the seven pea characters studied by Mendel are now known to be located on how many different chromosomes ?

In Drosophila, the sex is determined by : -

Pattern baldness, moustaches and beard in human males are examples of : -

Two crosses between the same pair of genotypes or phenotypes in which the sources of the gametes are reversed in one cross, is known as : -

Down's syndrome is caused by an extra copy of chromosome number 21. What percentage of offspring produced by an affected mother and a normal father wo...

Which one of the following conditions though harmful in itself, is also a potential saviour from a mosquito borne infectious disease ?

Which one of the following traits of garden pea studied by Mendel was a recessive feature ?

There are three genes a, b and c. The percentage of crossing over between a and b is 20%, b and c is 28% and a and c is 8%. What is the sequence of ge...

A gene said to be dominant if : -

A diseased man marries a normal woman. They get three daughter and five sons. All the daughter were diseased and sons were normal. The gene of this di...

On selfing a plant of F1 generation with genotype “AABbCC”,the genotypic ratio in F2 generation will be

Which of the following is a correct match -

Which of the following is the example of pleiotropy ?

Male XX and female XY sometime occur due to

Two nonallelic genes produces the new phenotype when present together but fail to do so independently then it is called : -

Ratio of complementry genes is : -

When dominant and recessive allels express itself together it is called : -

A and B genes are linked. What shall be genotype of progeny in a cross between AB/ab and ab/ab : -

Independent assortment of genes does not takes place when : -

Number of Barr bodies in XXXX female is

Sickle cell anaemia is induce to : -

Probability of four son to a couple is : -

In Drosophila the XXY condition leads to femaleness whereas in human beings the same condition leads to Klienfelter's syndrome in male. It proves :

Erythroblastosis foetalis is caused when :

Mongolian idiots are due to trisomy in 21st chromosome is called :

Due to the cross between TTRr × ttrr the resultant progenies showed how many percent plants tall, red flowered :

According to mendelism which character is showing dominance ?