What will be the genetic constitution of the offspring of a cross of individuals heterozygous (Zz) for an allele?

All ZZ

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All zz

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1/2 ZZ : 1/2 zz

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1/4 ZZ : 1/2 Zz : 1/4 zz

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Solution

The correct option is D 1/4 ZZ : 1/2 Zz : 1/4 zz
Gametes Z z
Z ZZ Zz
z Zz zz
When two heterozygous individuals (Zz crossed with Zz) are crossed then two types of gametes are formed (Z, z). The individuals in the F2 generation will be ZZ (1/4 i.e homozygous dominant) and Zz (2/4 i.e heterozygous ) and zz (1/4 i.e homozygous recessive). Thus the correct answer is option D.

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