Dihybrid Cross

Q.

A round seeded plant ( R ) is dominant to a wrinkled seeded plant ( r). What parental genotypes will produce offspring that are 50% homozygous dominant and 50% heterozygous dominant ?

1. rr and RR

2. RR and Rr

3. Rr and Rr

4. rr and rr

Q. What was the phenotypic ratio observed by Mendel, of two separate traits, shape and colour of seeds?

1. 9:3:3:1
2. 9:2:3:1
3. 9:2:3:1
4. All of the above

Q. Two pea plants, one with round green seeds (RRyy) and another with wrinkled yellow seeds (rrYY) produce F1 progeny that have round yellow seeds. When F1 plants are selfed, the F2 progeny will have new combinations of characters. Choose the new combination of characters from the following:

i. Round and yellow seeds
ii. Round and green seeds
iii. Wrinkled and yellow seeds
iv. Wrinkled and green seeds