Campbell Essential Biology with Physiology (5th Edition)
Campbell Essential Biology with Physiology (5th Edition)
5th Edition
ISBN: 9780321967671
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece, Kelly A. Hogan
Publisher: PEARSON
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Chapter 9, Problem 18PS
Summary Introduction

To explain:

The test which is used to determine whether the cat’s curl gene is dominant or recessive and whether it is autosomal or sex-linked.

Introduction:

The curl-back gene found in the cats during 1981 in Lakewood, California is an autosomal dominant gene. The purebred line of cat is a line that is generated through the process of cross between inbred lines with the same genetic background.

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As seen in the photo, Labradors come in three colors-- black, brown and yellow.  What is the genetic basis for these different coat colors?  One gene produces melanin, a pigment which is deposited in the dog's fur and makes the color dark.  With this gene, allele B (black) is dominant to allele b.  Only in the case of a recessive homozygote (bb) will the dog's phenotype be brown.  The regulatory gene is separate from the melanin gene but it acts as a switch, either turning the melanin gene on or turning it off.  Allele E is dominant and allows for the melanin to be deposited in the dog's fur ("on" switch), but if the switch gene is a recessive homozygote, the melanin is blocked ("off" switch) and a yellow dog is the result! Review the information on Labrador retrievers above.  What are the phenotypic ratios of the F1 generation offspring of two dihybrids? Make sure to match the numbers with coat colors (e.g, which number in the ration goes with which color).  Use a Punnett square to…
Part A) You cross a fly with straight wings with a fly with curved wings to produce the F1 generation, all of which exhibit straight wings. In the F2 generation, you observe 65 straight-winged flies and 16 curved-wing flies. Based upon the results, which phenotype is recessive? Part B) You think this trait is controlled by a single gene, but the F2 numbers don’t quite match a 3:1 expected ratio. Perform a chi-square analysis to determine if the variation you observe is due to chance or not. Based upon this determination, would you keep or reject the “null hypothesis”? Show your work and explain your reasoning.
A breeder is interested in a new coat colour in mice. This trait is controlled by a single autosomal gene (Gene T) with two alleles. The T-allele results in a yellow coat colour, while the recessive allele causes a cream coat colour. The breeder has a yellow mouse. Can you suggest how the breeder can determine the genotype (TT or Tt) of his mouse in a single cross? Describe this cross and provide details on how you would interpret the results.
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