Deafness in cocker spaniels is inherited. The allele for deafness is recessive to the allele for normal hearing Two cocker spaniels with normal hearing are mated together. They produce a litter of eight pups, two of which are found to be deaf. (a) Give the genotypes of the parents. (b) Show the possible genotypes, phenotypes and probabilities for the offspring. Genotypes Phenotypes (c) How many of the puppies will be unable to produce deaf offspring?

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Chapter20: Chromosomes And Human Genetics
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Deafness in cocker spaniels is inherited. The allele for deafness is recessive to the allele for normal hearing.
Two cocker spaniels with normal hearing are mated together. They produce a litter of eight pups, two of
which are found to be deaf.
(a) Give the genotypes of the parents.
(b) Show the possible genotypes, phenotypes and probabilities for the offspring.
Genotypes
Phenotypes
(c) How many of the puppies will be unable to produce deaf offspring?
Having dimples (D) is dominant over not having dimples (d). A dimpled woman (whose father had no
dimples and whose mother did have dimples) marries a man whose mother had no dimples, whose father
had no dimples, and whose grandparents on his father's side did have dimples!
(a)
What is the genotype of the woman?
What is the genotype of the man?
(b)
Genotypes
Phenotypes
(c)
How many different genotypes are possible among the offspring?
(d)
How many different phenotypes are possible among the offspring?
(e)
What is the probability of getting DD offspring?
()
What is the probability of getting dd offspring?
(g)
What is the probability of getting dimpled offspring?
(h)
What is the probability of getting offspring with no dimples?
(i)
What is the probability of getting homozygous offspring?
4
Transcribed Image Text:Deafness in cocker spaniels is inherited. The allele for deafness is recessive to the allele for normal hearing. Two cocker spaniels with normal hearing are mated together. They produce a litter of eight pups, two of which are found to be deaf. (a) Give the genotypes of the parents. (b) Show the possible genotypes, phenotypes and probabilities for the offspring. Genotypes Phenotypes (c) How many of the puppies will be unable to produce deaf offspring? Having dimples (D) is dominant over not having dimples (d). A dimpled woman (whose father had no dimples and whose mother did have dimples) marries a man whose mother had no dimples, whose father had no dimples, and whose grandparents on his father's side did have dimples! (a) What is the genotype of the woman? What is the genotype of the man? (b) Genotypes Phenotypes (c) How many different genotypes are possible among the offspring? (d) How many different phenotypes are possible among the offspring? (e) What is the probability of getting DD offspring? () What is the probability of getting dd offspring? (g) What is the probability of getting dimpled offspring? (h) What is the probability of getting offspring with no dimples? (i) What is the probability of getting homozygous offspring? 4
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