Question

The A/a and B/b genes are autosomal and 20 map unit apart. A pure individual showing the 'A' and 'b' phenotypes is crossed with a pure
individual with the 'a' and 'B' phenotypes. The offsprings produced by this cross, will produce gametes. What percentage of gametes will be of genotype 'ab' :-
(1) 40% (2) 50% (3) 25% (4) 10%​

Answer 1

Answer:

The factor of an allelic or allelomorphic pair which is unable to express its effect in the presence of its contrasting factor in a heterozygote is called recessive factor or allele, e.g., the allele t in hybrid tall pea plant Tt. The effect of recessive factor becomes known only when it is present in the pure or homozygous state, e.g. U in dwarf pea plant.