Chapter 3f - Nonallelic Interactions

Question 1

alternate form of a gene in which the alleles that affect a particular character are present at the SAME LOCUS of the gene

Answer 1

allelic gene

Question 2

alternate form of a gene in which the alleles that affect a particular character are present at a DIFFERENT LOCI of the gene

Answer 2

non allelic gene

Question 3

location of allelic gene

Answer 3

same location of the homologous chromosome

Question 4

location of non allelic gene

Answer 4

different locations of the homologous chromosome

Question 5

Two chromosomes in a pair – normally one inherited from the mother and one from the father

Answer 5

homologous chromosome

Question 6

gene interaction types of allelic genes

Answer 6

1. incomplete dominance
2. lethal factor
3. multiple alleles

Question 7

gene interaction types of non allelic genes

Answer 7

1. simple interaction
2. complementary factor
3. epistatis
4. inhibitory factor

Question 8

effects of non allelic gene

Answer 8

• could have no effect on phenotypes
• but cause inhibitory effect on other non-allelic genes

Question 9

effects of allelic genes

Answer 9

could form lethal genes and cause death

Question 10

Non-allelic interactions

Answer 10

1. novel phenotype / simple interaction
2. complementary gene action
3. duplicate gene action
4. recessive epistasis
5. dominant epistasis
6. dominant epistasis / inhibitory factor

Question 11

• new phenotypes result from interaction between dominants
• also from interaction from homozygous recessives

Answer 11

novel phenotype / simple interaction

Question 12

novel phenotype / simple interaction

Answer 12

9:3:3:1

Question 13

• there is complete dominance of both gene paris
• either recessive homozygote is epistatic to the effects of the other gene
• need both dominant alleles to show

Answer 13

complementary gene action

Question 14

complementary gene action

Answer 14

9:7

Question 15

• there is complete dominance at both gene pairs, but either gene when dominant is epistatic to the other
• if either both or only one dominant is present

Answer 15

duplicate gene action

Question 16

duplicate gene action

Answer 16

15:1

Question 17

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

Answer 17

recessive epistasis

Question 18

recessive epistasis

Answer 18

9:3:4

Question 19

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

Answer 19

dominant epistasis

Question 20

dominant epistasis

Answer 20

12:3:1

Question 21

• 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 21

dominant epistasis / inhibitory gene action

Question 22

dominant epistasis / inhibitory gene action

Answer 22

13:3