Chapter 12.6: Extensions to Mendel

Question 1

Define polygenic inheritance

Answer 1

describes a mode of inheritance in which more than one gene affects a trait

Question 2

What describes a mode of inheritance in which more than one gene affects a trait?

Answer 2

polygenic inheritance

Question 3

Define continuous variation

Answer 3

variation in a trait that occurs along a continuum such as the trait of height in human beings

Question 4

What is variation in a trait that occurs along a continuum such as the trait of height in human beings?

Answer 4

continuous variation

Question 5

Define qualitative trait

Answer 5

a trait that is determined by the effects of more than one gene

Question 6

What is a trait that is determined by the effects of more than one gene?

Answer 6

qualitative trait

Question 7

What is pleiotropy?

Answer 7

o An allele that has more than one effect on phenotype

Question 8

Define incomplete dominance

Answer 8

describes a case in which two or more alleles of a gene do not display clear dominance

Question 9

What describes a case in which two or more alleles of a gene do not display clear dominance?

Answer 9

incomplete dominance

Question 10

Define codominance

Answer 10

describes a case in which two or more alleles of a gene are each dominant to other alleles but not to each other

Question 11

What describes a case in which two or more alleles of a gene are each dominant to other alleles but not to each other?

Answer 11

codominance

Question 12

What are the sugars exhibited by type A blood?

Answer 12

galactosamine

Question 13

What are the sugars exhibited by type B blood?

Answer 13

galactose

Question 14

What are the sugars exhibited by type AB blood?

Answer 14

Both galactose and galactosamine

Question 15

What are the sugars exhibited by type O blood?

Answer 15

None

Question 16

What blood type can a type A blood type receive?

Answer 16

Receives A and O

Question 17

What blood type can a type B blood type receive?

Answer 17

Receives B and O

Question 18

What blood type can a type AB blood type receive?

Answer 18

Universal Receiver

Question 19

What blood type can a type O blood type receive?

Answer 19

Receives O

Question 20

What blood type can a type A blood type donate to?

Answer 20

Donates to A and AB

Question 21

What blood type can a type B blood type donate to?

Answer 21

Donates to B and AB

Question 22

What blood type can a type AB blood type donate to?

Answer 22

Donates to AB

Question 23

What blood type can a type O blood type donate to?

Answer 23

Universal Donor

Question 24

Define ABO Blood Group

Answer 24

a set of four phenotypes produced by different combinations of three alleles at a single locus

Question 25

What is a set of four phenotypes produced by different combinations of three alleles at a single locus?

Answer 25

ABO Blood Groups

Question 26

Define epistasis

Answer 26

interaction between two nonallelic genes in which one of them modifies the phenotypic expression of the other

Question 27

What is the interaction between two nonallelic genes in which one of them modifies the phenotypic expression of the other?

Answer 27

epistasis