High School

We appreciate your visit to Isolated populations of reindeer were identified in different locations each having a different colored nose at the North Pole they had red noses at the. This page offers clear insights and highlights the essential aspects of the topic. Our goal is to provide a helpful and engaging learning experience. Explore the content and find the answers you need!

Isolated populations of reindeer were identified in different locations, each having a different colored nose: at the North Pole they had red noses, at the South Pole they also had red noses, in Russia they had brown noses, and in Finland they had black noses.

To investigate the genetics of this trait, crosses were done between these pure breeding populations. A cross between Russian and North Pole reindeers resulted in F1 progeny all with black noses, but a cross between these yielded the following F2 progeny:

- Black: 89
- Red: 41
- Brown: 30

What is the most likely explanation for how this trait is regulated genetically?

A. Single gene, one allele incompletely dominant over the other
B. Two genes, red and brown, two alleles for both, with each having one allele completely dominant over the other, no interaction between the genes
C. Two genes, black and brown, two alleles for both, with each having one allele completely dominant over the other, black is recessively epistatic to brown
D. Two genes, black and brown, two alleles for both, with each having one allele completely dominant over the other, brown is recessively epistatic to black

(b) How can you determine if the North Pole reindeers are the same genotype as the South Pole reindeers?

A. Cross the South Pole reindeers to the North Pole reindeers and check the phenotype of the F1 progeny
B. Cross both to the Russian reindeers and check the phenotype of the F1 progeny
C. Cross the South Pole reindeers to the Finnish reindeers and check the phenotype of the F1 progeny

Answer :

The nose color in reindeer seems to be determined by two genes, with brown being recessively epistatic to black. It can be determined if South Pole and North Pole reindeer have the same genotype by crossing them and checking the phenotype of the offspring.

The most likely explanation for the genetic regulation of nose color in reindeer is option D: Two genes, black and brown, two alleles for both, with each having one allele completely dominant over the other, brown is recessively epistatic to black. The F1 progeny of a cross between Russian and North Pole reindeer being all black suggests that black is dominant. In the F2 progeny, the presence of three colors suggests the role of two genes. The proportions of the different colors also support this finding.

As for the second question, the best method of determining if South Pole and North Pole reindeer have the same genotype is A: Cross the South Pole reindeer to the North Pole reindeer and checking the phenotype of the F1 progeny. If they were genetically the same, all of the F1 offspring should have the same phenotype (red).

To know more about genes, visit:

https://brainly.com/question/33723717

#SPJ11

Thanks for taking the time to read Isolated populations of reindeer were identified in different locations each having a different colored nose at the North Pole they had red noses at the. We hope the insights shared have been valuable and enhanced your understanding of the topic. Don�t hesitate to browse our website for more informative and engaging content!

Rewritten by : Barada