A man and woman are both carriers for the recessive mutation that causes cystic fibrosis (genotype Dd). If they were to have three children together, what is the probability that none of the children would have cystic fibrosis (genotype dd). Express your answer as a fraction X/Y. Typed answer will be automatically saved.
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- A type of red-green colorblindness is inherited recessively on the X chromosome. A woman who is a carrier had children with a male that is not affected by the disease. Show your answers with the use of a Punnett square • What is the probability (% or likelihood) that a child is affected by the disease? • What is the probability (% or likelihood) that a son is a carrier? (Careful!) • Is there a chance that a girl of the couple is affected by the disease?If I got an A from my father and a O from my mother for my genotype. How would my phenotype be expressed? What is my blood type? Explain your reasoning for both answers.In fruit flies, eye color is carried on the X chromosome. The allele for red eyes is dominant over its recessive allele, white eyes. -Cross a heterozygous female to a white-eyed male 1st Question to answer ---- How many genotypes are possible among the offspring? 2nd Question to answer ---- How many phenotypes are possible among the offspring? 3rd Question to answer ---- What is the probability of getting a red-eyed male? 4th Question to answer ---- What is the probability of getting a white-eyed male? 5th Question to answer ---- What is the probability of getting a red-eyed female? 6th Question to answer ---- What is the probability of getting a white-eyed female? 7th Question to answer ---- What is the probability of getting a red-eyed offspring? 8th Question to answer ---- What is the probability of getting a white-eyed offspring?
- Duchenne muscular dystrophy is sex linked and usually affects only males. Victims of the disease become progressively weaker, starting early in life.a. What is the probability that a woman whose brother has Duchenne’s disease will have an affected child?b. If your mother’s brother (your uncle) had Duchenne’s disease, what is the probability that you have received the allele?c. If your father’s brother had the disease, what is the probability that you have received the allele?In humans, the genetic disease cystic fibrosis is caused by a recessive allele (a). The normal (healthy) allele is dominant (A). What is the genotype of someone who has cystic fibrosis? What are the two different genotypes that a healthy person could have? If two people were both heterozygous for the cystic fibrosis gene, what fraction of their children would be likely to have this disease? Hint: Draw a Punnett square to figure it out.The father of two children is type O+, and the mother is type A+. The children are O- and A+. Given this information, what are the genotypes of the father vs. the mother at both the “I” and “Rh” alleles? Explain your rationale.
- Duchenne muscular dystrophy is sex linked and usuallyaffects only males. Victims of the disease become progressively weaker, starting early in life.a. What is the probability that a woman whose brotherhas Duchenne’s disease will have an affected child?b. If your mother’s brother (your uncle) had Duchenne’sdisease, what is the probability that you have receivedthe allele?c. If your father’s brother had the disease, what is theprobability that you have received the allele?A couple who are about to get married learn from studying their family histories that, in both their families, theirunaffected grandparents had siblings with cystic fibrosis(a rare autosomal recessive disease).a. If the couple marries and has a child, what is theprobability that the child will have cystic fibrosis?b. If they have four children, what is the chance that thechildren will have the precise Mendelian ratio of 3:1 fornormal:cystic fibrosis?c. If their first child has cystic fibrosis, what is theprobability that their next three children will be normal?A woman who is blood type B has a child whose blood type is A; her husband is blood type O. Despite his wife’s claims of innocence, the irate father claims that the child is not his. Do you think that the wife is necessarily guilty of adultery? Explain. a. Do you think that the wife is necessarily guilty of adultery? Yes or no b. Can a homozygous blood type B and O have a child with blood type A? Yes or no c. Show your solution and explain your answer.
- Phenylketonuria (PKU) is an inherited disease caused by a recessive allele. Individuals with PKU have two recessive alleles and have very low levels of an enzyme that is needed to properly break down proteins. If a woman and her husband are both carriers and have three children, what is the probability of each of the following? Show your math. (Hint: You can represent your probabilities as fractions or decimals, but probabilities are always between 0 and 1) a. All three children are of normal phenotype. b. One or more of the three children have the disease. c.All three children have the disease.A couple who are a carrier of sickle-cell disease with blood type A for the female and type B for the male (assume heterozygosity for blood types). What is the probability that they will have a son with blood type B and is sickle- cell? Please show the solution.Phenylketonuria (PKU) is a disease that results from a recessive gene.Suppose that two unaffected parents produce a child with PKU. a. What is the probability that a sperm from the father will contain the PKU allele?b. What is the probability that an egg from the mother will contain the PKU allele?c. What is the probability that their next child will have PKU?d. What is the probability that their next child will be heterozygous for the PKU gene?
