Question

explain mendel's monohybrid experiment for3 marks
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Answer 1

Explanation:

First cross Edit

All the peas produced in the second or hybrid generation were round.

All the peas of this F1 generation have an Rr genotype. All the haploid sperm and eggs produced by meiosis received one chromosome 7. All the zygotes received one R allele (from the round seed parent) and one r allele (from the wrinkled seed parent). Because the R allele is dominant to the r allele, the phenotype of all the seeds was round. The phenotypic ratio in this case of Monohybrid cross is 1:1:1:1.

P gametes

(round parent)

R R

P gametes

(wrinkled parent)

r Rr Rr

r Rr Rr

Second cross Edit

Mendel then allowed his hybrid peas to self-pollinate. The wrinkled trait—which did not appear in his hybrid generation—reappeared in 25% of the new crop of peas.

Random union of equal numbers of R and r gametes produced an F2 generation with 25% RR and 50% Rr—both with the round phenotype—and 25% rr with the wrinkled phenotype.

F1 gametes

R r

F1 gametes R RR Rr

r Rr rr

Answer 2

Answer:

3:1. ratio

Explanation:

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