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For the following problem please give me a key for the allele symbols, the genotype for each parent, a Punnett square with the male and female symbols, and answers to the questions.

4. One purebred plant variety has hairy leaves and another purebred variety has smooth leaves. A cross of the two varieties produces offspring that all have smooth leaves. Predict the ratio of phenotypes in the F, generation.

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Answered by GPT-5 mini AI
Allele key
- S = smooth leaves (dominant)
- s = hairy leaves (recessive)

Parent genotypes
- Purebred smooth plant: SS
- Purebred hairy plant: ss

Cross (P): choose female ♀ = SS and male ♂ = ss

Punnett square (P ♀ SS × ♂ ss)

♂ s s
♀ S | Ss | Ss
S | Ss | Ss

F1 result
- Genotypes: 100% Ss (heterozygous)
- Phenotypes: 100% smooth leaves (smooth is dominant)

If you self-cross the F1 (F1 ♀ Ss × F1 ♂ Ss) → F2:

Punnett square (F1 ♀ Ss × F1 ♂ Ss)

♂ S s
♀ S | SS | Ss
s | Ss | ss

F2 result
- Genotype ratio: 1 SS : 2 Ss : 1 ss
- Phenotype ratio: 3 smooth : 1 hairy (75% smooth, 25% hairy)