Question 1:� What assumptions about the inheritance of alleles must you make to use a test-cross to determine the genotype of an individual expressing the dominant phenotype?
You must assume that the offspring produced in the test-cross must have a genotype of LL or Ll.
Question 2:� How would you determine the genotype of an agouti cat?
You can determine the genotype of an agouti cat by seeing if it has the dominant allele of "A".
Question 3: Why do population geneticists prefer to work with codominant genes?
Geneticists prefer to work with codominant genes because the codominant genes contain both alleles to study.
Question 4: Develop a table describing the possible genotypes and their phenotypes that could result from a cross between a tortoiseshell and a black cat.� Assume both cats are homozygous BB.
The offspring that are male will have a genotype of BB and will be either orange or black. The offspring that are female will have a genotype of BB and will have a coat that will be either orange, black, or tortoiseshell.
Question 5:� What effect might a striped (vs. solid) coat have on the fitness of a wild cat?
Striped wild cats have an advantage over solid wild cats because striped felines are able to blend in with their environment, either to ambush prey or hide from predators.
Question 6:� If you mated two white cats, would you be confident of always obtaining white progeny?� Explain.�
No, because it is possible that one of the white cats had an ancestor that could be a different color, its just been hiding the allele because it was recessive. At any time, one of the offspring could be a different color.
Question 7:� What factors determine allele frequency?� Is a dominant allele always the most frequent allele at a locus?�
The factors that determine allele frequency are mutations, genetic drifts, and migrations. Dominance of alleles are not always the most frequent allele at a locus.
Question 8:� Manx cats have no tail and relatively long rear legs.� What is the genotype of a Manx cat?� Do you expect the frequency of Manx cats to increase over time?� Why or why not?
The genotype of a Manx cat will be Mm. Yes they will increase over time due to breeding with other cats.
Mendel- Fudging- his- stuff- up Questions
Under this model, what is the chance of agreement between the observed and expected frequencies of smooth and wrinkled as close as that reported by Mendel, or closer?
The chance of a wrinkled is 1850 out of 7324 and the chance of a smooth is 5474 our of 7324.
What do you conclude on the basis of this one set of results about whether he fudged his data?
I think his data was fudged up. It can't be these results all the time. He needs to think about the ancestry of the plants and the alleles that the parents of the seeds had.
Blood Type Problem Set
1. Not Possible
2. A+, A-, O+, or O-
3. A+, A-, AB+, or AB-
4. A, AB, B, or O
5. AB or B
6. Unlikely
Yes, you can have a different blood type from your parents, because you can have parents with blood types of AB and B and yours could be O, since O blood is universal.
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