Monohybrid Genetics Problems Name ____________________ 1. Black coat is dominant over white coat in guinea pigs. A homozygous black pig is mated with another homozygous black pig. (a) What are the genotypes of the parents? (b) What will be the genotypes, phenotypes, and probabilities of the first generation? (c) What is the probability that white offspring will be produced? 2. A heterozygous black pig is mated with a homozygous black pig. (a) What are the genotypes of the parents? (b) Work the problem showing the possible genotypes and phenotypes of the offspring and the probabilities of each. 3. A black pig is mated to a white pig. In the F 1 generation there were 5 black and 5 white pigs. Give the genotypes of the parents. 4. Two heterozygous black pigs are mated. Show the genotypes, phenotypes, and probabilities of the offspring. 5. In Holstein cattle the spotting of the coat is recessive to the solid coat color. What types of offspring might be produced by a cross between two spotted animals? Give the genotypes and phenotypes of the offspring. 6. In peas, long stem “A” is dominant over short stem, “a”. Give the expected genotypes, phenotypes and the probabilities for the following crosses: a) homozygous long x short b) heterozygous long x short c) heterozygous long x homozygous long d) heterozygous long x heterozygous long 7. In man, normal pigmentation is due to a dominant allele “A” and albinism to its recessive allele “a”. A normal man marries an albino woman and their first child is an albino. What are the genotypes of these three people? 8. An albino man marries a normally pigmented woman who had an albino mother. What are the possible genotypes and phenotypes of the children of this couple and the probability of each? 9. Deafness in Cocker Spaniels is inherited. The allele for deafness is recessive to the allele for normal hearing. Two cocker spaniels with normal
Transcript
Monohybrid Genetics Problems Name ____________________
1. Black coat is dominant over white coat in guinea pigs. A homozygous black pig is mated with another homozygous black pig. (a) What are the genotypes of the parents? (b) What will be the genotypes, phenotypes, and probabilities of the first generation? (c) What is the probability that white offspring will be produced?
2. A heterozygous black pig is mated with a homozygous black pig. (a) What are the genotypes of the parents? (b) Work the problem showing the possible genotypes and phenotypes of the offspring and the probabilities of each.
3. A black pig is mated to a white pig. In the F1 generation there were 5 black and 5 white pigs. Give the genotypes of the parents.
4. Two heterozygous black pigs are mated. Show the genotypes, phenotypes, and probabilities of the offspring.
5. In Holstein cattle the spotting of the coat is recessive to the solid coat color. What types of offspring might be produced by a cross between two spotted animals? Give the genotypes and phenotypes of the offspring.
6. In peas, long stem “A” is dominant over short stem, “a”. Give the expected genotypes, phenotypes and the probabilities for the following crosses:
a) homozygous long x shortb) heterozygous long x shortc) heterozygous long x homozygous longd) heterozygous long x heterozygous long
7. In man, normal pigmentation is due to a dominant allele “A” and albinism to its recessive allele “a”. A normal man marries an albino woman and their first child is an albino. What are the genotypes of these three people?
8. An albino man marries a normally pigmented woman who had an albino mother. What are the possible genotypes and phenotypes of the children of this couple and the probability of each?
9. 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. (c) How many of the puppies will be unable to produce deaf offspring?
10. 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 are the genotypes of the man and woman?b) Show the cross.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?f) 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?
7. In man, normal pigmentation is due to a dominant allele “A” and albinism to its recessive allele “a”. A normal man marries an albino woman and their first child is an albino. What are the genotypes of these three people?
Normal man _______________ Albino Woman ________________ Child __________________
8. An albino man marries a normally pigmented woman who had an albino mother. What are the possible genotypes and phenotypes of the children of this couple and the probability of each?
What are the genotypes of the parents? ______________
9. 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.
Give the genotypes of the parents. _____________________
Show the possible genotypes, phenotypes and probabilities for the offspring.
(c) How many of the puppies will be unable to produce deaf offspring? __________________
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!
______________ What is the genotype of the woman?
______________ What is the genotype of the man?
___________ How many different genotypes are possible among the offspring?
___________ How many different phenotypes are possible among the offspring?
___________ What is the probability of getting DD offspring?
___________ What is the probability of getting dd offspring?
___________ What is the probability of getting dimpled offspring?
___________ What is the probability of getting offspring with no dimples?
___________ What is the probability of getting homozygous offspring?
