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.