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miv72 [106K]
3 years ago
8

A cross between homozygous red-eyed flies and homozygous white-eyed flies results in progeny that all have red eyes. this result

demonstrates:
Biology
1 answer:
faltersainse [42]3 years ago
4 0
This result demonstrates <span>dominance.
</span>In genetics we refer dominance as the relationship <span>between alleles of one gene or the</span><span> phenomenon which occurs in an individual which is containing two allelic forms of a gene and one allelic form of gene is expressed to the exclusion of the other allelic form of gene.</span>
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What is the typical F2 ratio in the case of dominant epistasis?
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Answer:

12:3:1

Explanation:

<em>The typical F2 ratio in cases of dominant epistasis is 12:3:1.</em>

<u>The epistasis is a form of gene interaction in which an allele in one locus interacts with and modifies the effects of alleles in another locus</u>. There are different types of epistasis depending on the type of alleles that are interacting. These include:

  • Dominant/simple epistasis: Here, a dominant allele on one locus suppresses the expression of both alleles on another locus irrespective of whether they are dominant or recessive. Instead of the Mendelian dihybrid F2 ratio of 9:3:3:1, what is obtained is 12:3:1. Examples of this type of gene interaction are found in seed coat color in barley, skin color in mice, etc.
  • Other types of epistasis include <em>recessive epistasis (9:3:4), dominant inhibitory epistasis (13:3), duplicate recessive epistasis (9:7), duplicate dominant epistasis (15:1), and polymeric gene interaction (9:6:1).</em>
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Explanation:

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