What is epistasis? What is the difference between dominant epistasis and recessive epistasis?

Expert Solution

Epistasis occurrs when one allele of a gene masks the expression of alleles of another gene.

When there is no epistasis a dihybrid cross (two characteristics) of two heterozygote individuals (each individual has one of each allele) results in a phenotypic ratio or 9:3:3:1 (both dominant : first dominant, second recessive : second dominant, first recessive : both recessive).

Recessive epistasis:

The epistatic allele is recessive, so for it to mask the other gene two copies are needed. To illustrate, dihybrid cross with a homozygous dominant individual and a homozygous recessive individual is carried out and a ratio of 9:3:4 (dominant both: dominant epistatic, recessive other:recessive epistatic) can be seen.

Dominant epistasis:

The epistatic allele is dominant, so only one copy is needed to mask the other gene. If the same cross as for recessive is carried out, a ratio of 12:3:1 (dominant epistatic: recessive epistatic, dominant other: recessive both) is obtained.

gladiator answered 2 years ago

What is the difference between dominant and recessive genes

What does the term “genetic recombination” mean? What is the difference between Dominant and Recessive inherited...

What does the term “genetic recombination” mean? What is the difference between Dominant and Recessive inherited disorders? Why are males more vulnerable to Sex-linked Recessive disorders?

Difference between Epistasis and Complementation including examples

A) In duplicate recessive epistasis why does having either an (aa) or (bb) genotype cause no...

A) In duplicate recessive epistasis why does having either an (aa) or (bb) genotype cause no pigment? B) Explain the differences between Duplicate Dominant epistatis and Dominant epistatis. When doing monohybrid crosses, how do their phenotypic ratios differ in the F2 from traditional Mendelian ratios for dominant alleles?

Use this information for the two questions below: A and a are dominant and recessive alleles,...

Use this information for the two questions below: A and a are dominant and recessive alleles, respectively, of the same gene pair. 14) Which genotype(s) would result in an individual with the dominant phenotype? A) Aa and aa B) only AA C) only Aa D) AA and Aa E) AA and aa 15) Which genotype(s) would result in an individual with the recessive phenotype? A) AA only B) Aa only C) AA or aa D) Aa or aa E) aa...

Define the following terms: Homozygous, heterozygous, dominant, recessive, incomplete dominance.

what do you know about the basics of genetics (Punnet Square, Dominant and recessive alleles)? Please...

what do you know about the basics of genetics (Punnet Square, Dominant and recessive alleles)? Please explain to me every single step in detail because I don't understand. Thank you!

In rabbits, black hair depends on a dominant allele, B. and brown on a recessive allele,...

In rabbits, black hair depends on a dominant allele, B. and brown on a recessive allele, b. Short hair is due to a dominant allele, S, and long hair to a recessive allele, s. A short, black haired male rabbit who is homozygous dominant for both traits is mated with a brown, long haired female a. Write the genotype (in letters) of both parents. b. Draw the Punnett square below illustrating the cross of the parental rabbits. c. What percentage...

In Genetics, it is known that the dominant and recessive traits show 3:1 ratio. A certain...

In Genetics, it is known that the dominant and recessive traits show 3:1 ratio. A certain flower has only two colors: white (dominant) and red (recessive), and a research observed colors of 100 flowers in a field. If he/she observed 67 white and 33 red. (a) Does this data support the claim in Genetics? (Use α = 0.1.) (b) Construct a 90% confidence interval for the proportion of white flowers. (c) Can we derived the conclusion of (a) based on...

In humans, hypercholesterolemia is a dominant autosomal disorder. Color-blindness is a recessive disorder carried on the...

In humans, hypercholesterolemia is a dominant autosomal disorder. Color-blindness is a recessive disorder carried on the X-chromosome. A woman with normal vision who does not have hypercholesterolemia takes her daughter to a doctor for an examination. In the course of the examination, the doctor discovers that the girl is color-blind and has hypercholesterolemia. What does the doctor automatically know about the genotype and phenotype of the girl’s father?

Question