Chapter 5 Flashcards
fur color in a species of mouse is controlled by a single gene pair. BB animals are black and bb animals are white. Bb animals have gray fur and each hair is gray.
what type of interaction is being shown by the tow alleles in heterozygous animals?
complete dominance codominance complementation incomplete dominance epistasis
incomplete dominance
in chickens, the dominant allele Cr produces the creeper phenotype (having extremely short legs)/ However, the creeper allele is lethal in the homozygous condition. the homozygous recessive genotype results in a normal individual.
if two creepers are mated, what will the phenotypic ratio among the living offspring be?
1 normal: 1 creeper 3 creepers: 1 normal 2 normal: 1 creeper 3 normal: 1 creeper 2 creepers: 1 normal
2 creepers: 1 normal
a boy have a blood type MN with a genotype of LmLn. his red blood cells possess both the M antigen and the N antigen.
what is the relationship between his two alleles for this gene?
codominance complementation incomplete dominance epistasis complete dominance
codominance
what type of gene action occurs when one gene masks the effects of another gene at a different locus?
anticipation epigenetics complementation genomic imprinting epistasis
epistasis
in humans, mitochondrial genetic disorders are inherited from only the mother. the severity of such diseases can vary greatly, even within a single family.
what form of inheritance does this represent?
sex-influenced inheritance genomic imprinting cytoplasmic inheritance sex-limited inheritance genetic maternal effect
cytoplasmic inheritance
with genetic maternal effect, the phenotype of an individual is determined by which of the statements?
the sex of the parent who transmits the gene to the individual
the sex of the individual with only one sex able to express the genotype
a combination of environmental factors and the genotype of the individual
the nuclear genotype of the maternal parent
cytoplasmic genes usually located in the mitochondria
the nuclear genotype of the maternal parent
Assume that each parent is homozygous for the specific allele and that the progeny are heterozygous. Classify which examples are complete dominance.
a red snapdragon and a white snapdragon produce a pink snapdragon
a mother with type A blood and a father with type B blood have a daughter with type AB blood
a pea plant with all purple flowers and a pea plant with all white flowers produce a pea plant with all purple flowers
a moth with red wings and a moth with yellow wings produce a moth with orange wings
a white cow and a red bull have a calf that is white with red spots (roan colored)
a pea plant with all purple flowers and a pea plant with all white flowers produce a pea plant with all purple flowers
Assume that each parent is homozygous for the specific allele and that the progeny are heterozygous. Classify which examples are incomplete dominance.
a red snapdragon and a white snapdragon produce a pink snapdragon
a mother with type A blood and a father with type B blood have a daughter with type AB blood
a pea plant with all purple flowers and a pea plant with all white flowers produce a pea plant with all purple flowers
a moth with red wings and a moth with yellow wings produce a moth with orange wings
a white cow and a red bull have a calf that is white with red spots (roan colored)
a red snapdragon and a white snapdragon produce a pink snapdragon
a moth with red wings and a moth with yellow wings produce a moth with orange wings
Assume that each parent is homozygous for the specific allele and that the progeny are heterozygous. Classify which examples are codominance.
a red snapdragon and a white snapdragon produce a pink snapdragon
a mother with type A blood and a father with type B blood have a daughter with type AB blood
a pea plant with all purple flowers and a pea plant with all white flowers produce a pea plant with all purple flowers
a moth with red wings and a moth with yellow wings produce a moth with orange wings
a white cow and a red bull have a calf that is white with red spots (roan colored)
a mother with type A blood and a father with type B blood have a daughter with type AB blood
a white cow and a red bull have a calf that is white with red spots (roan colored)
Suppose a species of tulip has three alleles for the gene that codes for flower color. The πΆπ
allele produces red tulips, the πΆπ
allele produces purple tulips, and the πΆπ€
allele produces white tulips. πΆπ
is dominant over πΆπ
and πΆπ€
, and πΆπ
is dominant over πΆπ€
.
For each cross, determine the expected phenotype ratio of offspring flower color.
CRCp x CpCw
CRCw x CpCw
CRCp x CpCw: 2 red: 2 purple: 0 white
CRCw x CpCw: 2 red: 1 purple: 1 white
A woman has blood type A MM. Her child has blood type AB MN. The blood types of the potential fathers are given in the table.
George: O NN Tom: AB MN Bill:B MN Claude: A NN Henry:AB MM
Based on their blood types, which of these men could be the father of this child?
Could be the father: Tom, Bill
Not the father: George, Claude, Henry
Which statement below defines epistasis?
when one gene influences or masks the effect of another gene
a measurement of phenotype intensity
when a heterozygote displays a phenotype intermediate between its two alleles
when a single gene affects several phenotypes
when one gene influences or masks the effect of another gene
A yellow female Labrador retriever was mated with a brown male. Half of the puppies were brown, and half were yellow.
Explain how the same female, when mated with a different brown male, could produce only brown offspring.
The first male was bb Ee, and the second male was Bb Ee.
The first male was bb Ee, and the second male was bb EE.
The first male was bb Ee, and the second male was bb ee.
The first male was bb EE, and the second male was bb Ee.
The first male was Bb EE, and the second male was Bb Ee.
The first male was bb Ee, and the second male was bb EE.
How are mitochondrial genes typically inherited?
An individual inherits one copy of mitochondrial DNA from each parent.
An individual randomly inherits their mitochondrial DNA from either parent.
An individual inherits their mitochondrial DNA from their mother.
An individual inherits their mitochondrial DNA from their father.
An individual inherits their mitochondrial DNA from their mother.
A maternal effect can cause the offspring phenotype ratio to depart from that of classic Mendelian inheritance. In a species of moth, the dominant allele N codes for brown eyes and recessive allele n codes for red eyes.
If an Nn female with brown eyes mates with an Nn male, what is the eye color phenotypic ratio of their offspring?
4, brown eyes : 0, red eyes
0, brown eyes : 4, red eyes
3, orange eyes : 1, red eyes
3, brown eyes : 1, red eyes
4, brown eyes : 0, red eyes
