Question

An apple plant has two dominant alleles for red apples, RR. If it is crossed with another plant that has recessive genes for green apples, rr, which percentage of the offspring will have red apples, assuming random chromosome segregation? A) 25% B) 50% C) 75% D) 100%

Answer 1

Answer:

Option D

Explanation:

Whenever there is cross between a Homozygous dominant  and a  Homozygous recessive parent, the offspring’s produced will be Heterozygous dominant

Here the  

Homozygous dominant red apple is represented by RR

Homozygous recessive apple is represented by rr

The cross between the two is represented by the punnet square as given below –  

R R

r Rr Rr

r Rr Rr

Thus all the offsprings possess heterozygous dominant allele.  

Answer 2

D)100

r r
R
R Rr Rr
Rr Rr