CAMPBEL BIOLOGY:CONCEPTS & CONNECTIONS
10th Edition
ISBN: 9780136538820
Author: Taylor
Publisher: INTER PEAR
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Chapter 9, Problem 16TYK
In 1981, a stray black cat with unusual rounded, curled-back ears was adopted by a family in Lakewood, California. Suppose you owned the first curl cat and wanted to breed it to develop a true-breeding variety. Describe tests that would determine whether the curl gene is dominant or recessive and whether it is autosomal or sex-linked. Explain why you think your tests would be conclusive. Describe a test to determine that a cat is true-breeding.
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Consider a situation where you have a parental cross with the mother and father phenotypes listed below. Remember that the genotype for the wild-type parent is always homozygous.
The counts of the F1 offspring are listed in Table 1. Two randomly selected individuals are selected and mated to produce a set of F2 individuals. If you test the F2 counts to determine whether they are consistent with an autosomal dominant mode of inheritance, what is your decision? Use a 0.05 significance level.
PARENTAL CROSS
Parental cross: Mother with disease phenotype, Father with wild-type phenotype.
Table 1. F1 DATA
Gender
Phenotype
Disease
Wild-type
Male
0
23
Female
0
34
Table 2. F2 DATA
Gender
Phenotype
Disease
Wild-type
Male
7
25
Female
0
25
A)Do not reject the null hypothesis that the F2 data are consistent with an autosomal dominant mode of inheritance; chi-square goodness of fit test statistic value is between 0 and 1.
B)Reject the null…
In Alaskan Malamute dogs, an autosomal recessive allele
causes a condition in which the cartilage in the front legs
fails to develop properly. This results in a type of
dwarfism. Dogs with the dominant wild-type allele are of
normal height.
In the same breed of dogs, there is an autosomal
dominant allele that codes for a curled tail and a
recessive allele that codes for an uncurled tail.
Show the possible genotypes for the offspring of a
dog heterozygous for height and tail curl crossed
with a dog recessive for both traits. Your answer must
include the use of a Punnett square and a legend
indicating the allele symbols used.
Deafness is often inherited in humans as an autosomal recessive trait. Assume that this is the case here. Two
severely deaf people meet and marry. They have four children and all of them have normal hearing. What is the
MOST reasonable explanation for this outcome?
Select one:
a. The mutant allele for deafness shows variable expressivity and the normal children may have some hearing loss that is
difficult to detect.
b. Complementation has occurred in the children, indicating that the deafness mutations in the parents involved different
genes.
c. Deafness in this family is most likely caused by an epigenetic change such as the addition of methyl groups to the
DNA.
d. Deafness in this family shows a genetic maternal effect with the condition being determined by the genotype of the
mother.
Chapter 9 Solutions
CAMPBEL BIOLOGY:CONCEPTS & CONNECTIONS
Ch. 9 - Connecting the Concepts 1. Complete this concept...Ch. 9 - Whether an allele is dominant or recessive depends...Ch. 9 - Edward was found to be heterozygous (Ss) for...Ch. 9 - Two fruit flies with eyes of the usual red color...Ch. 9 - A man with type B blood and a woman who has type A...Ch. 9 - Tim and Jan both have freckles (see Module 9.9),...Ch. 9 - Both Tim and Jan (problem 6) have a widows peak...Ch. 9 - In rabbits, black hair depends on a dominant...Ch. 9 - A fruit fly with a gray body and red eyes...Ch. 9 - A series of matings shows that the recombination...
Ch. 9 - A couple are both phenotypically normal, but their...Ch. 9 - Why do more men than women have colorblindness?Ch. 9 - In fruit flies, the genes for wing shape and body...Ch. 9 - Adult height in humans is at least partially...Ch. 9 - Heather was surprised to discover she suffered...Ch. 9 - In 1981, a stray black cat with unusual rounded,...Ch. 9 - SCIENTIFIC THINKING The breakthrough that led...
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