The dihybrid test cross ratio is 9 - 3 - 3 - 13 - 11 - 1 - 1 - 11 - 1

Question

Toppr Admin · Accepted Answer

A test cross is performed to determine the genotype of a dominant parent if it is a heterozygous or homozygous dominant- For the purpose- a dominant parent is crossed with the homozygous recessive parent- A test cross between F1 dihybrid and homozygous recessive dihybrid gives 1-1-1-1 ratio- Whereas selfing of dihybrid produces 9-3-3-1 ratio in the F2 generation and 3-1 ratio is obtained by self-pollination of monohybrid F1 progeny- A monohybrid test cross between F1 hybrid and the homozygous recessive parent gives 1-1 ratio-xA0-Thus- the correct answer is option D-

	List I		List II
A	Inhibitory gene ratio	1	9:3:4
B	Complementary gene ratio	2	1:1:1:1
C	Recessive epistasis ratio	3	12:3:1
D	Dihybrid test cross ratio	4	9:7
E	Dominant epistasis ratio	5	13:3

Column I	Column II
A. Inhibitory gene ratio	1. 9 : 3 : 4
B. Complementary gene ratio	2. 1: 1: 1 : 1
C. Recessive epistasis ratio	3. 12 : 3 : 1
D. Dihybrid test cross ratio	4. 13 : 3
E. Dominant epistasis ratio	5. 9: 7

The dihybrid test cross ratio is 9 : 3 : 3 : 13 : 11 : 1 : 1 : 11 : 1

The dihybrid test cross ratio is
9 : 3 : 3 : 1
3 : 1
1 : 1 : 1 : 1
1 : 1