There will be a 25% chance that the plant will have wrinkled seed.
Explanation:
The round seeds are dominant and can be considered homozygous for round seeds will have alleles RR
The wrinkled seeds are recessive and can be considered homozygous for wrinkled seeds will have alleles rr
When these are crossed
r r
R Rr Rr
R Rr Rr All the progeny are Heterozygous round seed
When These are crossed with plant heterozygous for round seeds
RrXRr
R r
R RR Rr
r Rr rr
The genotype ratio is 1:2:1 1 homozygous round, 2 heterozygous round, 1 homozygous wrinkled.
The phenotype ratio is 3:1 3 round and 1 wrinkled
Hence 25 % of the plants will have wrinkled seeds
