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Concept of Dominance and Recessiveness

If dominant a...

Question

If dominant alleles of two genes loci produce the same phenotype whether inherit separately or together it will be 1) recessive epistasis 2) dominant epistasis 3) duplicate genes interaction 4) inhibitory genes interaction

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Solution

duplicative gene interaction as one is duplicate of other and presence of one is enough to show its effect.

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When dominant epistasis is operative between two genes loci, the classical 9:3:3:1 ratio becomes modified into

Q. Match the genetic phenomena with their respective ratios.

	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

Match the column given above, genetic phenomena with their respective ratios.

Q. Epistasis is a type of gene interaction showing

Q. Match the columns I and II.

Column I	Column II
Pleiotropic gene	Both allele express equally
Codominance	Change in nucleotide
Epistasis	One gene shows multiple phenotypic expression
Mutation	Non - allelic gene inheritance

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Concept of Dominance and Recessiveness

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