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Biology · 2025 · 3 marks
CBSE 2025 · Region 2 · Set 1 · Q24
Using a Punnett square workout the distribution of an autosomal phenotypic feature in the first filial generation after a cross between a homozygous…
Using a Punnett square workout the distribution of an autosomal phenotypic feature in the first filial generation after a cross between a homozygous female and a heterozygous male for a single locus.
Marking-scheme solution
Cross - $\displaystyle 1$ $\displaystyle GG \times Gg$(Homozygous dominant female × Heterozygous male)gametes: $\displaystyle G$, $\displaystyle G$ and $\displaystyle G$, $\displaystyle g$Cross - $\displaystyle 2$ $\displaystyle gg \times Gg$(Homozygous recessive female × Heterozygous male)gametes: $\displaystyle g$, $\displaystyle g$ and $\displaystyle G$, $\displaystyle g$
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