What is the definition of epistasis?(1 point)
Responses
when one gene affects multiple phenotypes
when one gene affects multiple phenotypes
when the allele of one gene interferes with the expression of another gene
when the allele of one gene interferes with the expression of another gene
when a dominant allele for a specific trait is not completely expressed over the recessive allele
when a dominant allele for a specific trait is not completely expressed over the recessive allele
when one trait is determined by multiple genes
when the allele of one gene interferes with the expression of another gene
Which is an example of codominance?(1 point)
Responses
seed shape in pea plants
seed shape in pea plants
tall and short plant heights
tall and short plant heights
black and yellow coat color in Labrador retrievers
black and yellow coat color in Labrador retrievers
black and brown spotted coat color in horses
black and yellow coat color in Labrador retrievers
Consider that a plant with genotype RR has red flowers and a plant with genotype WW has white flowers. This plant species expresses incomplete dominance for flower color when the plant is heterozygous.
The offspring of a cross between an RR plant and a WW plant would be
(1 point)
Responses
all pink.
all pink.
all white.
all white.
pink and white.
pink and white.
red and pink.
pink and white.
A genetic disease is found in a family that affects the immune system, lungs, heart, and kidneys. A DNA analysis of several affected and unaffected family members determines that the disease is caused by a mutation in a single gene. What type of inheritance pattern is shown in this disease?(1 point)
Responses
polygenic trait
polygenic trait
codominance
codominance
pleiotropy
pleiotropy
incomplete dominance
pleiotropy
If a homozygous white horse CWCW and a homozygous black horse CBCB are bred together, what is the likelihood that their offspring will be roan with both colors represented in their hair if this gene follows a codominant inheritance pattern?(1 point)
Responses
50%
50%
100%
100%
0%
0%
25%