Epistasis

Question 1

Alleles that mask the effect

Answer 1

Epistatic Alleles

Question 2

Alleles whose effect is being masked

Answer 2

Hypostatic Alleles

Question 3

Occurs when dominant allele of one gene masks the effects of either alleles of the second gene

Answer 3

Dominant Epistasis

Question 4

Occurs when the recessive allele of one gene masks the effects of either allele of the second gene

Answer 4

Recessive Epistasis

Question 5

Ratio for Heterozygous Parents Recessive Epistasis

Answer 5

9:3:4

Question 6

More than 2 alleles and multiple genes control the expression of a trait

Answer 6

Polygenic Traits

Question 7

Either the trait is present or not

Answer 7

Discrete Traits

Question 8

Trait varies along a continuum

Answer 8

Continuous Traits

Question 9

Refers to a single characteristic that is controlled by more than 2 genes

Answer 9

Polygenic Inheritance

Question 10

Polygenic Inheritance patterns normally follow what shape

Answer 10

(Bell-shaped) Normal Distribution Curve

Question 11

T or F

Continuous Trait cannot be affected by the Environment

Answer 11

False

Question 12

If a Dominant Allele of both gene loci produces the same phenotype without cumulative effect

Answer 12

Duplicate Dominant Epistasis

Question 13

Duplicate Dominant Epistasis ratio

Answer 13

15:1

Question 14

Only one dominant gene of either allele is need to produce the phenotype

Answer 14

duplicate dominant epistasis

Question 15

Both gene loci have homozygous recessive alleles and both of them produce identical phenotype

Answer 15

Duplicate Recessive Epistasis

Question 16

Duplicate Recessive Epistasis ratio

Answer 16

9:7

Question 17

Dominant Alleles on both locus are required

Answer 17

Duplicate Recessive Epistasis

Question 18

In the absence of any dominant allele, the recessive allele is expressed

Answer 18

Duplicate Genes with Cumulative Effect

Question 19

Duplicate Gene with Cumulative Effect ratio

Answer 19

9:6:1

Question 20

Ratio of Dominant Recessive Interaction

Answer 20

13:3

Question 21

The phenomenon in which a single gene conditions several different phenotypic traits

Answer 21

Pleiotropy

Question 22

The mutated hemoglobin forms polymers and clumps together causing the deoxygenated sickle red blood cells to assume the disfigured sickle cell

Answer 22

Sickle Cell Anemia

Question 23

Caused by a defect in the phenylalanine hydroxylase enzyme

Answer 23

Phenylketonuria

Question 24

Lack of thyroxine from birth or before birth

Answer 24

Cretinism

Question 25

Genes with at least one allele that, when present in the genotype, will cause death

Answer 25

Lethal Genes

Question 26

Dominant Epistasis ratio

Answer 26

12:3:1

Question 27

Recessive Epistasis ratio

Answer 27

9:3:4