Non-allelic Interactions

Question 1

Two or more independent genes present on the same or different chromosomes interact to produce a new expression

Answer 1

Non-allelic Interactions

Question 2

Non-allelic Interactions

Answer 2

1. Novel Phenotype
2. Complementary Gene Action
3. Duplicate Gene Action
4. Recessive Epistasis
5. Dominant Epistasis

Question 3

F2 Phenotypic Ratio of Novel Phenotype

Answer 3

9:3:3:1

Question 4

___ phenotype result from interaction between _____; also from interaction from _____ _____

Answer 4

• New
• dominants
• homozygous recessive

Question 5

Example of Novel Phenotype

Answer 5

• Chicken Comb
• Lentil: seed coat color

Question 6

Novel Phenotypes can arise from the combined action of ___ of __ ___

Answer 6

Alleles of Two Genes

Question 7

In novel phenotype, how many phenotypes in F2?

Answer 7

4 distinct F2 Phenotypes

Question 8

• there is complete dominance of both gene pairs; but either recessive
• homozygote is epistatic to the effects of the other gene

Answer 8

Complementary Gene Action

Question 9

F2 Phenotypic Ration of Complementary Gene Action

Answer 9

9:7

Question 10

Complementary Gene Action: ___ ____ allele of each of ___ ____ is necessary to produce ____

Answer 10

• one dominant
• two genes
• phenotype

Question 11

Example of Complementary Gene Action

Answer 11

• Petal color in flowers
• Sweet Pea flower coloration

Question 12

There is complete dominance at both gene pairs, but either gene when dominant, is epistatic to the other

Answer 12

Duplicate Gene Action

Question 13

F2 Phenotypic Ratio of Duplicate Gene Action

Answer 13

15:1

Question 14

Example of Duplicate Gene Action

Answer 14

Shape of seen capsule in Shepherd’s purse

Question 15

There is complete dominance at both gene pairs, but one gene when homozygous recessive, masks the effect of the other

Answer 15

Recessive Epistasis

Question 16

F2 Phenotypic Ratio of Recessive Epistasis

Answer 16

9:3:4

Question 17

Recessive Epistasis: _____ recessive of one gene ____ both ____ of another gene

Answer 17

• Homozygous
• masks
• alleles

Question 18

Example of Recessive Epistasis

Answer 18

• Coat color in mice
• Onion Bulb colors
• Retreiver: coat color

Question 19

What is the basis of epistasis in mouse coat color?

Answer 19

Clear when the biochemical pathway is considered

Question 20

It is modified black hair with yellow stripes

Answer 20

Agouti hair

Question 21

The pigment that produces stripe yellow hair or red

Answer 21

Pheomelanin (Phaeomelanin)

Question 22

What is the function of the wild-type agouti gene product?

Answer 22

To switch from eumelanin to phaeomelanin

Question 23

What is Epistasis?

Answer 23

When the alleles of one gene masks the expression of alleles of a second gene

Question 24

There is complete dominance at both gene pairs, but one gene, when dominant masks the effect of the other

Answer 24

Dominant Epistasis 1

Question 25

F2 Phenotypic Ratio of Dominant Epistasis 1

Answer 25

12:3:1

Question 26

Dominant Epistasis 1: _____ allele of one gene _____ effects of _____ ____ of another gene

Answer 26

• dominant
• hides
• both alleles

Question 27

Example of Dominant Epistasis 1

Answer 27

Fruit color in squash

Question 28

• there is complete dominance at both gene pairs, but one gene when dominant, is epistatic to the second
• the second gene when homozygous recessive, is epistatic to the first

Answer 28

Dominant Epistasis 2

Question 29

F2 Phenotypic Ratio of Dominant Epistasis 2

Answer 29

13:3

Question 30

Dominant Epistasis 2: ____ alleles of one gene ____ effects of ____ ____ of another gene

Answer 30

• Dominant
• hides
• dominant allele

Question 31

Example of Dominant Epistasis 2

Answer 31

Feather color in Fowl