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Principles Of Inheritance And Variation

Question
CBSEENBI12003069
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Match the following Column I with Column II.

Column I Column II
A. Complementrary Ratio  1. 9:7
B. Supplementary Ratio 2. 9:3:4
C. Epistatic Ratio 3. 12:3:1
D. Inhibitory Ratio 4. 13:3

  • A-4, B-1, C-3, D-2

  • A-1, B-2, C-3, D-4

  • A-4, B-1, C-2, D-3

  • A-1, B-3, C-2, D-4

Solution

B.

A-1, B-2, C-3, D-4

Epistasis is an interaction between two or more genes to control a single phenotype. Dominant epistasis also called masking has a ratio 12:3:1 in the F2 phenotype supplementary genes which is recessive epistasis has ratio 9:3:4

Complementary gene where both dominant alleles are needed for phenotype has ratio 9:7. Inhibitor gene where one gene inhibits is an expression of another gene has ratio 13:3 in F2 progeny.

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Distinguish between homogametic and heterogametic organisms.

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