As genomes become sequenced it has become evident that genes become duplicated as a mechanism of evolution. In some cases, recently duplicated genes perform identical functions. Suppose genes R and S are of unlinked genes that in fact arose recently from such a gene duplication event. If two Rr Ss individuals are mated, what would be the phenotypic ratio of their progeny. Assume r is recessive to R and s is recessive to S.

Biology (MindTap Course List)
11th Edition
ISBN:9781337392938
Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Chapter19: Evolutionary Change In Populations
Section: Chapter Questions
Problem 2TYU: In a diploid species, each individual possesses (a) one allele for each locus (b) two alleles for...
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As genomes become sequenced it has become evident that genes become duplicated as a mechanism of evolution. In some cases, recently duplicated genes perform identical functions. Suppose genes R and S are of unlinked genes that in fact arose recently from such a gene duplication event. If two Rr Ss individuals are mated, what would be the phenotypic ratio of their progeny. Assume r is recessive to R and s is recessive to S.

   

9:7

   

1:2:1:2:4:2:1:2:1

   

12:3:1

   

9:3:3:1

   

15:1

Expert Solution
Step 1

The fourth option, 9:3:3:1 is the correct answer. 

Here, in the question, it is mentioned that genes are not linked and thus will follow Mendel's Law of Independent Assortment. Let us look at the dihybrid cross mentioned in the question. 

RrSs x RrSs

Types of gametes obtained from one parent: RS, Rs, rS, rs. Similar types will be obtained from the other parent. 

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