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Genetics Ch4

front 1

A mutation in a gene often results in a reduction of the product of that gene. The term for this type of mutation is ________.
A) codominance
B) incomplete dominance
C) gain of function
D) multiple allelism
E) loss of function or null (in the case of complete loss

back 1

E

front 2

With incomplete dominance, a likely ratio resulting from a monohybrid cross would be ________.
A) 3:3
B) 1:2:2:4
C) 1:2:1
D) 9:3:3:1
E) 3:1

back 2

C

front 3

The presence of more than two alternative forms of a given gene would be called ________.
A) multiple alleles
B) alternation of generations
C) codominance
D) incomplete dominance
E) hemizygosity

back 3

A

front 4

A condition in which one gene pair masks the expression of a nonallelic gene pair is called ________.
A) codominance
B) epistasis
C) dominance
D) recessiveness
E) additive alleles

back 4

B

front 5

Typical ratios resulting from epistatic interactions in dihybrid crosses would be ________.
A) 9:3:3:1, 1:2:1
B) 1:1:1:1, 1:4:6:4:1
C) 9:3:4, 9:7
D) 1:2:2:4:1:2:1:2:1, 1:2:1
E) 3:1, 1:1

back 5

C

front 6

With which of the following would hemizygosity most likely be associated?
A) codominance
B) incomplete dominance
C) trihybrid crosses
D) X-linked inheritance
E) sex-limited inheritance

back 6

D

front 7

Because of the mechanism of sex determination, males of many species can be neither homozygous nor heterozygous. Such males are said to be ________.
A) dominant
B) hemizygous
C) recessive
D) complementary
E) None of the answers listed is correct

back 7

B

front 8

Assume that a mutation occurs in the gene responsible for the production of hexosaminidase A, such that only about 50% of the enzyme activity is found in the heterozygote compared with a homozygous normal individual. If heterozygotes are phenotypically normal, we would say that the mutant allele is recessive to its normal allele

back 8

True

front 9

A 9:7 ratio indicates incomplete dominance.

back 9

False

front 10

With both incomplete dominance and codominance, one expects heterozygous and homozygous classes to be phenotypically identical.

back 10

False

front 11

With multiple alleles, there can be more than two genetic alternatives for a given locus.

back 11

True

front 12

The ABO blood group locus in humans provides an example of epistasis.

back 12

False

front 13

A typical epistatic ratio is 9:3:4.

back 13

True

front 14

Alleles that are masked by an epistatic locus are said to be hypostatic to the genes at that locus

back 14

True

front 15

Hemizygosity is the term used to describe the state of a gene that has no allele on the opposing chromosome

back 15

True

front 16

Sex-limited inheritance is the same as sex-linked inheritance.

back 16

False

front 17

Pattern baldness and hen/cock feathering in fowl are examples of X-linked inheritance.

back 17

False

front 18

One result of X-linkage is a crisscross pattern of inheritance in which sons express recessive genes of their fathers and daughters express recessive genes of their mothers.

back 18

False

front 19

A conditional mutant is one whose expression is influenced by some environmental condition

back 19

True

front 20

Penetrance specifically refers to the expression of lethal genes in heterozygotes.

back 20

False

front 21

Expressivity is the term used to describe the balanced genetic output from a hemizygous condition

back 21

False

front 22

Genomic imprinting occurs when one allele converts another

back 22

False

front 23

Genomic anticipation refers to observations that a genetic disorder occurs at an earlier age in successive generations, whereas genetic imprinting occurs when gene expression varies depending on parental origin

back 23

True

front 24

The term expressivity defines the percentage of individuals who show at least some degree of expression of a mutant genotype

back 24

False