an unaffected woman who is heterozygous for the x linked allele causing duchenne muscular dystrophy has children with a normal man. What is the probability that their first child is an unaffected daughter and their second child is an affected son?
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an unaffected woman who is heterozygous for the x linked allele causing duchenne muscular dystrophy has children with a normal man. What is the probability that their first child is an unaffected daughter and their second child is an affected son?
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- A color-blind man marries a woman with normal vision whose father was color-blind. Remember that color-blindness is an X-linked recessive trait. Hint: see figure 12.7 in book. A) What is the probability that their first child will be a color-blind daughter? B) What is the probability that their first son will be color-blind?In a cross between an individual with Huntington disease and an unaffected individual, what are the chances their progeny will have the disease, considering that it is a dominant trait?A mother is heterozygous for the X-linked gene for colorblindness and also heterozygous for the autosomal inherited sickle cell anemia. She is married to a man who can see color normally and who is heterozygous for sickle cell trait. Using b (colorblind), B (normal color), S (normal hemoglobin), s (sickle cell), answer the following: a. What are the genotypes of the parents? b: What is the probability of having a child who is both color blind and has sickle cell anemia?
- The autosomal (not X-linked) gene for brachydactyly, short fingers, is dominant to normal finger length. Assume that a female with brachydactyly in the heterozygous condition is married to a man with normal fingers. What is the probability that their first child will be a brachydactylous girl? ¼ 1/2 1/8 3/4 2/3Duchenne Muscular Dystrophy (DMD) is an X-linked recessive trait. Fill in a Punnett square for a man with DMD and a woman who carries DMD. Then use your Punnett square to answer the following questions: A) What is the probability that one of their daughters will have DMD? ___% B) What is the probability that one of their daughters is a carrier of DMD? ______ % C) What is the probability that one of their sons will have DMD? ______ % D) What is the probability that one of their sons is a carrier of DMD? ______ % E) On which chromosome is the gene for DMD located? _____A form of hemophilia is caused by a sex-linked (X-linked) recessive gene. A phenotypically normal woman whose father had hemophilia marries a man who suffers with hemophilia. What is the probability that their first daughter will have hemophilia?
- A man with hemophilia (a recessive, sex-linkedcondition) has a daughter without the condition.She marries a man who does not have hemophilia.What is the probability that their daughter willhave hemophilia? Their son? If they have foursons, what is the probability that all will be affected?A human female heterozygous for X-linked trait causing red-green color blindness marries a red-green color-blind male. What is the probability of their FEMALE children having red-green color blindness?Julie (a female) has hemophilia. Based on this information, what can we say about the genotypes of her parents? If Julie has children with a normal male, what is the chance that her sons have hemophilia? What is the chance that her daughters have hemophilia? A condition called Alport syndrome is caused by a dominant X linked allele. Males who have this condition usually have kidney failure, while females who are heterozygous for the condition have blood in the urine, but usually do not have kidney failure. A male has this condition and has children with an unaffected female What percent of his daughters will show any of the symptoms? What percent of his sons will show any of the symptoms?
- Hemophilia is an X-linked recessive gene. A normal woman who is a carrier for hemophilia marries a man with hemophilia. Draw a punnett square of a cross between these two individuals. What are the chances that this couple will have a daughter with hemophilia?Hemophilia is a sex-linked recessive trait. A male hemophiliac and phenotypically normal female have a son with hemophilia. They would like to have one more child. What is the probability of having a child without hemophilia? Explain using a Punnett square. Is it possible for a girl to be born with hemophilia? Explain.A man with X-linked color blindness marries a woman with no history of color blindness in her family. The daughter of this couple marries a normal man, and their daughter also marries a normal man. What is the chance that this last couple will have a child with color blindness? If this couple has already had a child with color blindness, what is the chance that their next child will be color blind?