CBSE 2023 · Region 5 · Set 1 · Q19 · 2 marks
By using Punnett square depict the genotypes and phenotypes of test crosses (where green pod colour (G) is dominant over yellow pod colour (g)) in Garden pea with unknown genotype.
Marking-scheme solution
Case I -Homozygous dominant
Phenotype: All green coloured pod
Case II- Heterozygous dominant
Phenotype: $\displaystyle 50$% green & $\displaystyle 50$% yellow colour pod
| GG | × | gg |
| een Pods | Yellow Pods | |
| G | G |
| g | Gg | Gg |
| g | Gg | Gg |
| Gg | × | gg |
| eeen Pods | - | Yellow Pods |
| ↓ | ||
| G | g | |
| Gg | gg | |
| Gg | gg |
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CBSE Class 12 Biology past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.