What is the definition of epistasis?(1 point)

Question

Responses

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 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 one gene affects multiple phenotypes
when one gene affects multiple phenotypes

when one trait is determined by multiple genes

Answer 1

The correct definition of epistasis is when the allele of one gene interferes with the expression of another gene.

Answer 2

Which is an example of codominance?(1 point)
Responses

black and yellow coat color in Labrador retrievers
black and yellow coat color in Labrador retrievers

seed shape in pea plants
seed shape in pea plants

black and brown spotted coat color in horses
black and brown spotted coat color in horses

tall and short plant heights

Answer 3

The example of codominance is black and brown spotted coat color in horses. In codominance, both alleles are fully expressed in the phenotype. In this case, both black and brown spots can be seen in the coat color.

Answer 4

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.

pink and white.
pink and white.

red and pink.
red and pink.

all white.

Answer 5

The offspring of a cross between an RR plant (red flowers) and a WW plant (white flowers), given that the species expresses incomplete dominance for flower color, would be all pink. In incomplete dominance, the heterozygous phenotype (RW) is a blend of the two parental phenotypes. Therefore, all offspring will exhibit the pink flower color.

Answer 6

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

incomplete dominance
incomplete dominance

codominance
codominance

pleiotropy

Answer 7

The type of inheritance pattern shown in this disease is pleiotropy. Pleiotropy occurs when a single gene mutation affects multiple phenotypic traits or systems, as seen in this case with effects on the immune system, lungs, heart, and kidneys.

Answer 8

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

0%
0%

25%
25%

50%
50%

100%

Answer 9

If a homozygous white horse (CWCW) is bred with a homozygous black horse (CBCB), and the gene follows a codominant inheritance pattern, all the offspring will inherit one allele from each parent (CW from the white horse and CB from the black horse).

Therefore, the genotype of the offspring will be:

• CWCB (roan, with both colors represented in their hair).

Thus, the likelihood that their offspring will be roan is 100%.