Principles of Inheritance and Variation · Biology · AIIMS
MCQ (Single Correct Answer)
Mark the incorrect statement for inbreeding.
Match the following columns and choose the correct option from the codes given below.
| Column I | Column II | ||
|---|---|---|---|
| A. | Pleiotropic gene | (i) | Both alleles express equally |
| B. | Co-dominance | (ii) | Change in nucleotides |
| C. | Epistasis | (iii) | One gene shows multiple phenotypic expression |
| D. | Mutation | (iv) | Non-allelic gene inheritance |
Blood group of the father is ‘A’ and blood group of mother is ‘B’. Then predict the blood group of the progeny
Assertion : Down’s syndrome, Klinefelter’s syndrome and Turner’s syndrome are chromosomal disorders.
Reason : In Klinefelter’s syndrome females are sterile.
Select the incorrect statement(s) from the options given below with respect to dihybrid cross.
I. Tightly linked genes on the same chromosome show higher recombinations.
II. Genes far apart on the same chromosome show very few recombinations.
III. Genes loosely linked on the same chromosome show similar recombinations.
A normal woman whose father was colourblind, marries a normal man. What kinds of children can be expected and in what proportion?
Which one of the following conditions correctly describes the manner of determining the sex?
Assertion Phenylketonuria is recessive hereditary disease caused by body’s failure to oxidise an amino acid phenylalanine to tyrosine, because of defective enzyme.
Reason It is characterised by in the presence of phenylalanine acid in urine.
Assertion The non-allelic genes for red hair and prickles are usually inherited together.
Reason The genes for red hair and prickles are located on the same chromosome in close association.