Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN: 9781305389892
Author: Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher: Cengage Learning
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Chapter 12, Problem 14TYK
In chickens, feathered legs are produced by a dominant allele F. Another allele f of the same gene produces featherless legs. The dominant allele P of a gene at a different locus produces pea combs; a recessive allele p of this gene causes single combs. A breeder makes the following crosses with birds 1, 2, 3, and 4; all parents have both feathered legs and pea combs:
Cross Offspring
What are the genotypes of the four birds?
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In the rat, the pattern of coat color is affected by a gene with two alleles. PH is the allele for hooded, in
which the animal is mostly white with color restricted to the shoulders and neck. P+ is the normal solid
body color allele. These two alleles exhibit incomplete dominance, so that heterozygotes have white
bellies only.
A true-breeding solid strain is crossed with a true-breeding hooded strain, to produce an F₁ generation
that is all white belly. The F₁ generation rats are mated with each other to produce 800 F₂ offspring.
Below is a table that gives the observed number of each phenotype in the F2 and also gives you the
expected number.
Question: If you perform a Chi-square goodness of fit test, what is the value of Chi square X² (Express
your answer to the hundredths.)
solid
white belly
hooded
Σ
Observed
195
420
185
800
Expected
200
400
200
800
In corn the genes for tassel length (alleles T and t) and rust resistance (alleles R and r) are known to be on separate chromosomes. In the course of a routine mating check experiment, a breeder got the following results upon crossing T/t:R/r with a double recessive strain (t/t;r/r):
genotype
Number of progeny
T/t; R/r
98
t/t; r/r
104
T/t; r/r
3
t/t; R/r
5
In addition to these data she noted that the cobs contain only about 50% of the expected kernels. Note that in corn, each kernel is the result of one mating or can be considered one progeny. Hence 50% of the matings are not producing viable offspring.
Based on the location of these genes on separate chromosomes what is the expected result?
Suggest a hypothesis of a genetic process that could be used to explain the potential karyotype of one of these parents.
What are the actual genotypes of the parents?
In corn the genes for tassel length (alleles T and t) and rust resistance (alleles R and r) are known to be on separate chromosomes. In the course of a routine mating check experiment, a breeder got the following results upon crossing T/t:R/r with a double recessive strain (t/t;r/r):
genotype
Number of progeny
T/t; R/r
98
t/t; r/r
104
T/t; r/r
3
t/t; R/r
5
In addition to these data she noted that the cobs contain only about 50% of the expected kernels. Note that in corn, each kernel is the result of one mating or can be considered one progeny. Hence 50% of the matings are not producing viable offspring.
Draw a diagram showing the arrangement of the alleles on the parental chromosomes.
Based on your hypothesis from part b, reassign genotypes to the progeny classes. Enter your new genotypes into the table above as an additional column.
If the karyotype was done on the progeny what unusual feature would be observed?
Chapter 12 Solutions
Biology: The Dynamic Science (MindTap Course List)
Ch. 12.1 - Two pairs of traits are segregating in a cross....Ch. 12.1 - If, instead, the four phenotypes in question 1...Ch. 12.2 - Palomino horses have a golden coat color, with a...Ch. 12.2 - A true-breeding rabbit with agouti (mottled,...Ch. 12 - The dominant C allele of a gene that controls...Ch. 12 - In peas, the allele Le produces tall plants and...Ch. 12 - Prob. 3TYKCh. 12 - What genotypes, and in what frequencies, will be...Ch. 12 - In addition to the two genes in problem 4, assume...Ch. 12 - Prob. 6TYK
Ch. 12 - In cats, the genotype AA produces tabby fur color;...Ch. 12 - Prob. 8TYKCh. 12 - The ability of humans to taste the bitter chemical...Ch. 12 - A man is homozygous dominant for alleles at 10...Ch. 12 - In guinea pigs, an allele for rough fur (R) is...Ch. 12 - Prob. 12TYKCh. 12 - Some recessive alleles have such a detrimental...Ch. 12 - In chickens, feathered legs are produced by a...Ch. 12 - A mix-up in a hospital ward caused a mother with O...Ch. 12 - Having malformed hands with shortened fingers is a...Ch. 12 - Prob. 17TYKCh. 12 - Design an Experiment Imagine that you are a...Ch. 12 - Prob. 19TYKCh. 12 - Prob. 1ITDCh. 12 - Prob. 2ITDCh. 12 - Half of the worlds population eats rice at least...
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