Using a Punnett square, work out distribution of phenotypic features in first filial generation afte

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4.Principles of Inheritance and Variation

hard

Using a Punnett square, work out the distribution of phenotypic features in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus.

Option A

Option B

Option C

Option D

Solution

In guinea pigs, heterozygous male with black coat colour $(Bb)$ is crossed with the female having white coat colour $(bb)$. The male will produce two types of gametes, $\mathrm{B}$ and $\mathrm{b}$, while the female will produce only one kind of gamete, $r$. The genotypic and phenotypic ratio in the progenies of $\mathrm{F}_{1}$ generation will be same i.e., $1: 1$. (figure)

Standard 12

Biology