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Question
In a homozygous plant round seeds (R) are dominant over wrinkled seeds (r) : Draw a Punnett square to show the gametes and offspring when both the plants have heterozygous round seeds (Rr).
Solution
The cross is as follows :
Parents : Rr (Round) x Rr (Round)
Gametes : Rr
Punnett square :
Both plants are with heterozygous round seeds (Rr)
| Gametes | R | r |
| R |
RR (Homozygous round seeds) |
Rr (Heterozygous round seeds) |
| r |
Rr (Heterozygous round seeds) |
rr (Homozygous wrinkled seeds) |
Therefore the ratio will be 1 (homozygous round) : 2 (heterozygous round) : 1 (wrinkled)
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