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Biology Name: ___________________________ Genetics Problems 1. Albinism is a condition in which a person does not make skin pigment. It is caused by a recessive allele. Normal skin pigment is the dominant trait. Cross a homozygous pigmented person with an albino. What are the phenotype and genotype probabilities of their children? 2. Cross two heterozygous pigmented parents. What are the phenotype and genotype probabilities of their children? 3. Cross a heterozygous normally pigmented parent with an albino parent. What are the phenotype and genotype probabilities of their children? 4. Brown eyes are dominant to blue eyes. A brown eyed man marries a blue eyed woman. The first child is blue eyed. What is the man’s genotype? Show a punnett square to prove this. 5. Tall pea plants are dominant to short pea plants. Two heterozygous tall pea plants were crossed and they produced 100 seeds. What types of pea plants are EXPECTED to grow from these 100 seeds? List the phenotype probabilities. 6. Mr. A has blue eyes, but both his parents have brown eyes. Mrs. A has brown eyes; her mother has brown eyes but her father has blue eyes. Mrs. A has seven brothers and sisters, all of whom have brown eyes. Indicate the genotype of the following” Mr. A _______________ Mrs. A _________________ Mr. A’s father ___________ Mrs. A’s father ________________ Mr. A’s mother ___________ Mrs. A’s mother _______________ What proportion of Mr. and Mrs. A’s children will have brown eyes? _____________ Biology Sex Linkage Problems Name: _____________________________ 1. In fruit flies, red eye color (R) is dominant over white eye color (r), and the trait is linked on the X chromosome. What genotypes and phenotypes will result from a cross between a redeyed male and a heterozygous red-eyed female? 2. Hemophilia is sex linked to the X chromosome, and it is recessive genetic disorder. A carrier woman mates with a man who has hemophilia. What are the odds of having a child with hemophilia? 3. In humans, color blindness (c) is recessive to normal vision (C) and is sex-linked. Two parents with normal vision have a color -blind son. What is the probability that their next child will be a color blind daughter? 4. Why are males more afflicted with recessive sex linked traits than females? 5. Can a male transmit a sex linked trait on the X chromosome to his son? Explain. Biology Name: _______________________________ Blood type problems 1. Cross a homozygous Type A person with a heterozygous Type B person. Show all possible results for their children. 2. Cross a Type AB person with a Type O person. Show all possible results for their children. 3. A woman with type AB blood marries a man with type A blood. His mother had type O blood. What blood type is not likely to occur among the couple’s children. Explain by showing work. 4. A man has type A blood and his wife has Type B blood. A physician types the blood of their 4 children and is amazed to find one of each of the 4 blood types among them. Explain how this can happen. Show work. Biology Incomplete Dominance Name: ___________________________ 1. When white chickens (W) are mated with black chickens (W’), the baby chicks are grey (WW’). Cross two grey chickens and list the genotype and phenotype probabilities of their offspring. Show the punnett square. 2. Cross a grey chicken with a white chicken and list the genotype and phenotype probabilities of the baby chicks. Show the punnett square. 3. When yellow guinea pigs (Y) are crossed with white guinea pigs (y), cream colored offspring are produced (Yy). Can a pet store owner mate a cream colored male and a white female to obtain yellow guinea pigs? Show your work. 4. A cross between round radishes (R) and long radishes(r) produces oval radishes (Rr). In a radish breeding experiment, the following radishes were obtained: 25 long radishes: 52 oval radishes:26 round radishes Determine the probable genotypes and phenotypes of the parent radish plants. Show work.