Ch. 5 Extensions and Modification of Basic Principles

Question 1

If red is dominant and white is recessive and they are crossed, the offspring are pink

Answer 1

incomplete dominance

Question 2

If red is dominant and white is recessive, and they are crossed, the offspring are red with white spots

Answer 2

codominance

Question 3

Incomplete dominance phenotypic ratio of two heterozygotes

Answer 3

1:2:1

Question 4

Individuals with the same genotype can have the phenotype or not have the phenotype

Answer 4

incomplete penetrance

Question 5

Some people have the phenotype to a different degree (more vs less affected), but all are affected to some degree

Answer 5

variable expressivity

Question 6

One of the genotypes will never be viable

Answer 6

lethal allele

Question 7

When there are more than 2 alleles at a given locus

Answer 7

multiple alleles

Question 8

True or False: blood type is an example of multiple alleles

Answer 8

True

Question 9

This occurs when one gene masks the expression of another gene

Answer 9

epistasis

Question 10

True or False: the hypostatic gene is the gene that may. be masked

Answer 10

True

Question 11

True or False: the epistatic gene is the gene that does the masking

Answer 11

True

Question 12

True or False: Epistasis is always a dihybrid

Answer 12

True

Question 13

What is the phenotypic ratio for two complete heterozygotes in a dihybrid cross?

Answer 13

9:3:3:1

Question 14

What is the phenotypic ratio for two complete heterozygotes in recessive epistasis?

Answer 14

9:3:4

Question 15

What is the phenotypic ratio for two complete heterozygotes in dominant epistasis?

Answer 15

12:3:1

Question 16

What is the phenotypic ration for two complete heterozygotes in duplicate recessive epistasis?

Answer 16

9:7

Question 17

What traits are dominant in males and recessive in females (or vice versa)?

Answer 17

sex-influenced traits

Question 18

What traits only appear. in females and never in males (or vice versa)?

Answer 18

sex-limited traits

Question 19

True or False: sex-influenced traits are on the sex-chromosomes

Answer 19

False

Question 20

True or False: sex-linked are on the sex chromosomes

Answer 20

True

Question 21

True or False: sex-limited traits are on the sex chromosomes

Answer 21

False

Question 22

The phenotype of the offspring is determined by the genotype of the mother

Answer 22

genetic maternal effect

Question 23

True or False: if a trait follows the genetic maternal effect, the father can affect the physical appearance of his grandchildren

Answer 23

True

Question 24

What type of allele is only expressed in certain temperatures

Answer 24

temperature-sensitive allele