9. Study the diagram below, which represents the genotypes of two parents and on

Question

9. Study the diagram below, which represents the genotypes of two parents and one gamete from each parent. TA Parents widows peak straight hairline melosis Gametes Offspring a) What is the genotype of the offspring? b) What is the phenotype of the offspring? Explain your reasoning. 10. Suppose that two siblings both have attached earlobes, and their parents have unattached earlobes. Unattached earlobes are represented as E, and attached earlobes are represented by e. What are the genotypes of the parents? Explain your reasoning 11. There are two types of American rat terrier dogs. One type is hairless and the other type does have hair. The presence or absence of hair is a genetically determined trait. Some female rat terriers with hair produce only puppies with hair, but other females with hair can produce hairless puppies. Explain how this can occur The two alleles are hair and hairless, so use H and h as symbols for the alleles.

Explanation / Answer

9. a. Genotype will be Ww

b. Phenotype will be 'widow's peak', because of the dominant allele 'W' which will suppress the expression of 'w'.

10.

siblings are having attached earlobes

If the unattached earlobe is represented as 'E' and attached earlobes are represented as 'e'.

sibling offsprings must have 'ee' genotype. The one 'e' allele is inherited from father and other from mother.

According to given data both the parents were having unattached earlobe but offsprings are having attached earlobes. So parents genotype is "Ee"

11.

Hair - H

Hairless - h

case-1

female rat terriers with hair (HH or Hh) produce only puppies with hair, so female genotype is HH

So the genotype of male dog does not matter for the phenotype of the puppies for this generation

because if the male dog will homozygous(HH) or heterozygous(Hh) terrier with hairless (hh), it they will produce puppies with hair.

All offspring will have hair.

case-2

female rat terriers with hair (HH or Hh) can produce hairless puppies, so female genotype is Hh

So the genotype of male dog does matters here for the phenotype of the puppies for this generation

because if the male dog will homozygous(HH) or heterozygous(Hh) terrier with hairless (hh), they will produce puppies with hair.

possibility

E e E EE - unattached earlobes Ee - unattached earlobes e Ee - unattached earlobes ee - attached earlobes

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