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- One gene that affects three traits is an example of ________. a. dominance c. pleiotropy b. codominance d. epistasisColor blindness is an X-linked trait caused by a recessive alle A carrier female marries a normal male a. How many male offspring can be expected to be color-blind and have a normal vison? b. How many female offspring can be expected to be carriers and to be normal?For an X-linked recessive allele, what proportion of female offspring will be carriers in the cross of an affected father and a noncarrying mother? a.50 percent b.0 percent c.100 percent
- 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?Hemophilia is an X-linked recessive phenotype. Suppose a man who expresses the hemophilia phenotype has children with a woman who has the normal phenotype (and does not have a family history of hemophilia). If the couple have a son, what are the chances that he will have hemophilia? A) 50% B) 25% C) 0% D) 100%Suppose a woman is a symptomless carrier of a recessive x-linked disease. If her husband has the disease, what is the chance that their first child is a girl who also has the disease? A)100% B)50% C)0% D)25%
- Color 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.A couple wish to have children, but the father has an X-linkedrecessive trait. Assuming that the mother does not carry thetrait, what percentage of their sons may inherit the trait?a. 0% d. 75%b. 25% e. 100%c. 50%Colour-blindness is the result of an X-linked recessive allele, Xc. The allele for normal eyesight is XC. (a) A woman with normal colour vision whose father was colour-blind marries a colour-blind man. Give the genotypes and phenotypes of their children. What ratio of their children can be expected to be colour-blind? (b) A man with normal colour vision whose father was colour-blind marries a woman carrier of the colour-blind allele. What is the likelihood that their children will be colour-blind? Carriers of the trait?
- In humans, the allele for red-green color blindness is X-linked and recessive. An XY man with normal color vision marries a color-blind XX woman who gives birth to a XX color-blind daughter. A] What is the phenotype and genotype ratios possible for a child born to this couple. B] What is the probability that the second XX daughter of this same couple will also be color blind? C] What is the probability that the next child this couple produces together will be a color-blind XY son? D] What can you tell me about the first color-blind daughter born?A male affected with an X-linked dominant trait will have what proportion of offspring affected with the trait? a. 1/2 sons and 1/2 daughtersb. All sons and no daughtersc. All daughters and no sonsd. 3/4 daughters and 1/4 sonsWhat must be true for a male individual to be a carrier of a Y-linked recessive allele? A. The gene has no other alleles. B. The gene is only expressed in females. C. The gene is silenced on the Y chromosome. D. The gene is also found on the X chromosome.