3. (1 point) Consider the number of cats with short hair or with long hair in th

Question

3. (1 point) Consider the number of cats with short hair or with long hair in the cat population (the photo set) that you saw in lab. Assume that the photos of different phenotypes accurately represent the frequency of traits in a real cat population. Can you tell whether the allele for short hair or the allele for long hair is dominant? Explain your reasoning. (1 pt) 4. In cats, the B gene controls hair color (the dominant B allele-black, and the recessiveb allele brown). The S gene controls spotting (the dominant S allele - white spots, and the recessive s allele-no spots). The D gene controls the density of hair pigment. The recessive d allele allows the full color of the B and b alleles to show. The dominant D allele dilutes the color so that black color becomes gray, and brown color becomes tan. For eaclh cat shown below, identify the possible genotyp(s) for the B, S, and D genes. (Be sure to view the document in color.) (0.5 point each) 5. If you wanted to determine the genotype of the gray and white cat (the third cat shown above), you could do a test cross. What is the genotype and phenotype of the second cat you would use for the test cross? (1 pt)

Explanation / Answer

3) The cats with long hair are more dominant over short hair phenotypes cats. Dominance character of long hair is masking the character of short hair which is recessive.

4) Cat 1 bbssDD

Which has brown tan color due to recessive bb alleles and no white spots with ss alleles and the D alleles forced tan color.

Cat 2 BBssdd

This cat has dominant black color with short hair density due to ss alleles and no tan color which is due to recessive d alleles

Cat 3

    This cat has black color which changed to grey due to D alleles and short hair density with ss alleles and white spots also seen.

Cat 4: bbSSDD

The cat is of white color with bb alleles and SS alleles allowing the white spots and DD genes changing the brown color to tan.

5) The phenotype of the second cat will be BBSSDD with all dominant characters with all homozygous traits alleles will help in test cross.

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