Set up a Punnett square using the parent genotype listed below (Round seeds are dominant to wrinkled seeds) RR X Rr
What % of the offspring will be round?
0
25
50
75
100

The correct answer would be - 100

Explanation:

It is given that round seeds caused by allele R is dominant over the r which is responsible for the wrinkled seeds. The cross between plants with RR which is round seed and Rr that is heterozygous for the round seed plant,

The possibilities of the round seed plant by the above cross can be found with the help of Punnett square:

Gametes: R, R and R, r

Cross

     R       R

R   RR     RR

r    Rr       Rr

There are two dominant and two heterozygous round seed offsprings produces, however phenotypically all the offsprings are round, therefore 100% of the offspring will be round.

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