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Chapter 12: Q. 31 (page 328)

Explain epistasis in terms of its Greek-language roots 鈥渟tanding upon.鈥�

Short Answer

Expert verified

The interplay of genes which affects a phenotype is referred as epistasis.

Step by step solution

01

Step. 1 Introduction 

The expression with one gene is altered by that of the expression with one maybe more separately genetic inheritance, which is termed as epistasis.

02

Step. 2 Explanation 

An antagonistic association amongst genomes occurs when one gene conceals or hinders with that of the activity of the other. This interference gene is often referred as epistatic, as if it were "standing upon" another (hypostatic) gene to inhibit its expression.

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Most popular questions from this chapter

A farmer raises black and white chickens. To his surprise, when the first generation of eggs hatch all the chickens are black with white speckles throughout their feathers. What should the farmer expect when the eggs laid after interbreeding the speckled chickens hatch?

a. All the offspring will be speckled.

b. 75% of the offspring will be speckled, and 25% will be black.

c. 50% of the offspring will be speckled, 25% will be black, and 25% will be white.

d. 50% of the offspring will be black and 50% of the offspring will be white.

People with trisomy 21 develop Down鈥檚 syndrome. What law of Mendelian inheritance is violated in this disease? What is the most likely way this occurs?

Figure 12.16 In pea plants, purple flowers (P) are dominant to white flowers (p) and yellow peas (Y) are dominant to green peas (y). What are the possible genotypes and phenotypes for a cross between PpYY and ppYy pea plants? How many squares do you need to do a Punnett square analysis of this cross?

How many different offspring genotypes are expected in a trihybrid cross between parents heterozygous for all three traits when the traits behave in a dominant and recessive pattern? How many phenotypes? a. 64 genotypes; 16 phenotypes b. 16 genotypes; 64 phenotypes c. 8 genotypes; 27 phenotypes d. 27 genotypes; 8 phenotypes

The ABO blood groups in humans are expressed as the IA, IB, and i alleles. The IA allele encodes the A blood group antigen, IB encodes B, and i encodes O. Both A and B are dominant to O. If a heterozygous blood type A parent (IAi) and a heterozygous blood type B parent (IBi) mate, one-quarter of their offspring will have AB blood type (IAIB) in which both antigens are expressed equally. Therefore, ABO blood groups are an example of:

  1. multiple alleles and incomplete dominance

  2. codominance and incomplete dominance

  3. incomplete dominance only

  4. multiple alleles and codominance
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