Mendel first crossed pure-bred pea plants having round-yellow seeds with pure-bred pea plants having wrinkled-green seeds and found that only round-yellow seeds were produced in the F1 generation. When F 1 generation pea plants having round-yellow seeds were cross-bred by self-pollination, then peas having round � yellow seeds, round green seeds, wrinkled-yellow seeds and wrinkled-green seeds were produced. Mendel collected a total of 2160 seeds. (a)What will be the number of? (i) Round green seeds (ii) Wrinkled green seeds (iii) Round yellow seeds, and (iv) Wrinkled-yellow seeds (b) Which 'ratio' as established by Mendel have you made use of in answering the part (a) above?

Question

Mendel first crossed pure-bred pea plants having round-yellow seeds with pure-bred pea plants having wrinkled-green seeds and found that only round-yellow seeds were produced in the F1 generation. When F 1 generation pea plants having round-yellow seeds were cross-bred by self-pollination, then peas having round &#xFFFD; yellow seeds, round green seeds, wrinkled-yellow seeds and wrinkled-green seeds were produced. Mendel collected a total of 2160 seeds. (a)What will be the number of? (i) Round green seeds (ii) Wrinkled green seeds (iii) Round yellow seeds, and (iv) Wrinkled-yellow seeds (b) Which 'ratio' as established by Mendel have you made use of in answering the part (a) above?

Philoid · Accepted Answer

(a) The F2 generation obtained had Round yellow: Round green: Wrinkled yellow: Wrinkled green in the ratio 9:3:3:1

(i) Round Green seeds- (3/16)*2160= 405

(ii) Wrinkled Green seeds- (1/16)*2160= 135

(iii) Round yellow seeds- (9/16)*2160= 1215

(iv) Wrinkled yellow seeds- (3/16)*2160= 405

(b) Dihybrid ratio has been used in answering this question because here are two different varieties, that differ in two observed traits i.e. Shape : round and wrinkled; Color: yellow and green.