X-linked recessive traits in humans (or in Drosophila) are observed ________. a. in more males than females b. in more females than males c. in males and females equally d. in different distributions depending on the trait
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X-linked recessive traits in humans (or in Drosophila) are
observed ________.
a. in more males than females
b. in more females than males
c. in males and females equally
d. in different distributions depending on the trait
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- When crossing two fruit flies with red eyes, which is a dominant trait, half of the male offspring are born with white eyes, but none of the females are. What is this an example of? A. an autosomal recessive trait B. an autosomal dominant trait C. an X-linked recessive trait D. an X-linked dominant traitNow assume that the pedigree shown in question 1 shows the inheritance of a rare genetic disease. a) The disease is most likely autosomal dominant b) The disease is most likely autosomal recessive c) The disease is equally likely to be either autosomal dominant or autosomal recessive, but cannot be x-linked d) Cannot be determined from the information givenAlleles for Tay-Sachs disease are inherited in an autosomal recessive pattern. Why would two parents with a normal phenotype have a child with Tay-Sachs? a. Both parents are homozygous for a Tay-Sachs allele. b. Both parents are heterozygous for a Tay-Sachs allele. c. New mutations gave rise to Tay-Sachs in the child. d. b or c
- Hemophilia is an X-linked recessive disease. A hemophilic man marries a woman who is not a carrier of the disease. (a) Draw a Punnett square showing the genotypes of their children. (b) What are the chances that their daughters will be carriers of the disease? (c) What percentage of their children are likely to have the disease?Which statement best describes the reason maternal recessive CYP1A1 polymorphisms of CYP1A1 decrease birth weight in children of smokers? Answer choices (a) It reduces the metabolism of nicotine (b) It increases the metabolism of nicotine (c) It reduces the metabolism of PAHs (d) It increases the metabolism of PAHsOne form of the bleeding disorder known as von Willebrand disease is an autosomal recessive disease. A man who is a carrier marries a woman who is also a carrier of the disease. (a) What percentage of their children are likely to have a disease phenotype? (b) What percentage of their children are likely to have a normal phenotype? (c) What percentage of their children are likely to be carriers of the disease?
- Two normal-looking fruit flies were crossed, and, in the progeny, there were 202 females and 98 males.a. What is unusual about this result?b. Provide a genetic explanation for this anomaly.c. Provide a test of your hypothesis.a man has simpson syndrome, an addiction to certain television series. his wife does not have this syndrome. the couple has four children. A) can this syndrome be caused by autosomal recessive gene? B) Can it be caused by an x linked recessive allele ? C) What about wiggly ears?Albinism, lack of pigmentation in humans, results from an autosomal recessive gene (a). Two parents with normal pigmentation have an albino child. (a) What is the probability that their next child will be albino? (b) What is the probability that their next child will be an albino girl? (c) What is the probability that their next three children will be albino?
- What is Polygenic Inheritance? A) When one gene has many effects B) The additive effect of 2 or more genes C) The genes that cause skin colorColor blindness in men is controlled by a recessive gene located on the X chromosome. Can a brother and sister with color blindness have another normal brother? A. Yes, if the mother is a carrier. B.Yes, if the mother is homozygous. C.Yes, if the father is heterogametic. D.Yes, if the father is a carrier.Red–green color blindness in humans is due to an X-linked recessive gene. A womanwhose father is color blind possesses one eye with normal color vision and one eye with colorblindness.(a) Propose an explanation for this woman’s vision pattern.(b) Would it be possible for a man to have one eye with normal color vision and one eye withcolor blindness?.
