Campbell Essential Biology with Physiology (6th Edition)
Campbell Essential Biology with Physiology (6th Edition)
6th Edition
ISBN: 9780134711751
Author: Eric J. Simon, Jean L. Dickey, Jane B. Reece
Publisher: PEARSON
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Chapter 9, Problem 21PS
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! 1. Two other Labradors mate and produce puppies. Their genotypes are Bbee and BbEe.  What color are each parent and what are the phenotypic rations of their offspring in the F1 Generation?  Show your work with a Punnett square.
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.
The bison herd on Konza Prairie has begun to show a genetic defect. Some of the males  have a condition known as "rabbit hock" in which the knee of the back leg is malformed  slightly. This condition is controlled by a sex-linked gene and it is recessive. Now,  suppose that the herd bull (the dominant one which does most of the breeding) who is  normal (XN) mates with a cow that is a carrier for rabbit hock.  What are his chances of producing a normal son (bull)? If he mates with this cow every year, what percentage of their daughters will have normal knees? What percentage of their daughters will be carriers of rabbit hock?
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