Question

What are the combinations of character in the $F_2$ progeny in Mendel's experiment?

• A. (i) Round yellow 9, (ii) Round green 3, (iii) Wrinkled yellow 3, (iv) Wrinkled green 1
• B. (i) Round yellow 9, (ii) Round green 1, (iii) Wrinkled yellow 3, (iv) Wrinkled green 1
• C. (i) Round yellow 3, (ii) Round green 1, (iii) Wrinkled yellow 3, (iv) Wrinkled green 1
• D. (i) Round yellow 3, (ii) Round green 9, (iii) Wrinkled yellow 3, (iv) Wrinkled green 1

Answer 1

The correct option is A (i) Round yellow 9, (ii) Round green 3, (iii) Wrinkled yellow 3, (iv) Wrinkled green 1

Mendel crossed pea plants having round green seeds (RRyy) with pea plants having wrinkled yellow seeds (rrYY).

An example of dihybrid cross:

Since, the F${}_1$ plants are formed after crossing pea plants having green round seeds and pea plants having yellow wrinkled seeds. F${}_1$ generation will have both these characters in them. However, as we know that yellow seed colour and round seeds are dominant characters, therefore, the F${}_1$ plants will have yellow round seeds.

Then, this F${}_1$ progeny was self-pollinated and the F${}_2$ progeny was found to have yellow round seeds, green round seeds, yellow wrinkled seeds and green wrinkled seeds in the ratio 9:3:3:1.