Question

Mendel crossed pea plants having yellow seeds ( $YY$ ) with pea plants having green seeds ( $yy$ ). Yellow seeds are obtained in $F_1$ progeny which undergoes self-pollination to produce $F_2$ progeny. Select the option showing the result of $F_2$ progeny.

A.
3 green : 1 yellow
B.
1 yellow : 1 green
C.
3 yellow : 1 green
D.
2 green : 2 yellow

Accepted Answer

C. Crossing $YY 	imes yy$ gives $F_1$ heterozygous ($Yy$) yellow seeds. Selfing $Yy 	imes Yy$ gives $F_2$ phenotypic ratio of 3 yellow (dominant) : 1 green (recessive).

Mendelian monohybrid cross F2 ratio

Explanation

Practise this under board exam conditions