What are the chances that their child will be: 1. a colour-blind male? 4. a normal male? 2. a colour blind female? 5. a normal female? 5. The couple has a colour blind male child. What are the chances that their next child will be a normal female?
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5. Red-Green colour blindness is inherited as an X-linked recessive trait in humans. A woman, who’s
mother had red-green colour blindness marries a colour blind man. What are the chances that their
child will be:
1. a colour-blind male? 4. a normal male?
2. a colour blind female? 5. a normal female?
5. The couple has a colour blind male child. What are the chances that their next
child will be a normal female?
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- 9. Red-green color blindness is inherited as an X-linked recessive (Xc). If a color-blind man marries a woman who is heterozygous for normal vision, what would be the expected phenotypes of their children with reference to this character? In your answer, specify in your phenotype descriptions the gender of the children. (For example, don’t just say 75% of the children would be colorblind – you would instead say 100 % of the daughters would be colorblind and 50% of the sons would be colorblind. Note that this is not a correct answer; it is just to give you an idea of how to explain the correct phenotypes of the cross.)___13. A dominant x-linked allele (B) gives normal color vision but the recessive allele (b) causes red-green color blindness.A. What is the genotype of a man with normal color vision whose father was color- blind? B. What is the genotype of a woman with normal color vision whose father was color-blind? C. If a woman who is colorblind marries a man with normal vision, what would you expect for the genotypes and phenotypes of their children? D. If a man is color-blind, which parent did he inherit the gene from? Explain your answer. E. Which parent does a man get all his x-linked genes from? F. If a woman is color-blind, what do you know about the genotypes and phenotypes of her parents? G. Are men more likely than women to get a genetic disease which is x-linked and dominant? Are they more likely to get a disease that is x-linked and recessive? Explain your answers. H. Can a man with normal color vision have a colorblind daughter? Explain your answer.…1. Red-green colorblindness is caused by a recessive allele (x) at an X-linked gene, and albinism is caused by a recessive allele (a) at an autosomal gene. A phenotypically normal woman (Sara) has a father who is colorblind, and she knows that she is a carrier for albinism. She plans to have a child with a colorblind man (Abdul) who is also a carrier for albinism. What is the probability that Sara and Abdul's child will have one of the conditions, but not both? (C. Follow the steps below to answer this question. a) What is the cross? b) What are the target genotypes? Note: it might be useful to come back to this one and double- check it after you have completed step c, below. Break this down to the single gene level by answering the following questions: a. What is the proportion of normal to albino offspring? Show the Punnett square: b. What is the proportion of normal to colorblind offspring? Show the Punnett square: d) What is the probability that Sara and Abdul's child will have one…
- 7. A boy born with colour blindness has a dad who is colour blind but his mom is not. He is most likely to have gained the sex-linked allele of colour blindness from: a maternal relative only the allele is most likely a spontaneous mutation and was not inherited either a paternal or maternal relative a paternal relative only1. A red eyed male is crossed with a white eyed female, what eye color should their progenies have? In what ratio? 2. A red eyed female is crossed with a white eyed male. One of their progeny has white eyes. What other possible phenotypes can the progeny have? In what ratio? 3. Suppose color blindness is a X linked trait in humans. It is also recessive. A phenotypically normal woman has a father with color blindness. This woman marries a man with normal vision. What is the chance of their children being color blind? What is the chance of their daughters being color blind?1. Mary and Joe are both healthy individuals. Joe has a mother who suffered from cystic fibrosis, an autosomal recessive disorder. Mary has been genetically tested in order to find out if she has the allele responsible for this disease and her tests came out positive. They are planning on having two children together in the near future. What is the probability that she and Joe will have either 2 boys who have the disorder, OR that they have one boy who has the disorder and one boy who does not? (in other words, what is the probability that any of these two outcomes takes place? a) 1/8 b) 1/16 c) 3/32 d) 1/64 e) 9/64
- 13. Which of the following is true regarding X linked recessive traits? More males are affected than females because they have nothing to maska recessive allele carried on the X chromosome More females are affected than males because they have nothing to mask a recessive allele carried on the X chromosome. More females are affected than males because they have an extra X More males are affected than females because they have an extra X8. Which of the following is true given a mating between a woman who is a carrier for color blindness and a non color blind male. Remember this is a x linked recessive trait. 1. This couple could have a color blind son. 2. All their children would be color blind 3. This couple could have a color blind daughter 4. None of their children would be color blind1. An albino man whose parents are both normal marries a woman one whose parents is normal and the other albino. She has an albino sister. The couple has a normal son. a. Is albinism a dominant or a recessive trait? Explain your answer. b.Give genotypes of all the persons involved. c. The couple plans to have more kids. What is the probability of their second child being normal?
- 1. Red-green color blindness is an X-linked recessive trait in humans. Polydactyly (extra fingers and toes) is an autosomal dominant trait. Martha has normal fingers and toes and normal color vision. Her mother is normal in all respects, but her father is color blind and polydactylous. Bill is color blind and polydactylous. His mother has normal color vision and normal fingers and toes. Bill and Martha are married and about to have a child. a. Draw out a pedigree for all people mentioned in this problem. Fill in the left side of the box for anybody who is colorblind and fill in the right side of the box for anybody who is polydactyl. b. Determine the genotypes of Bill and Martha (it should look something like XBYDD) c. What is the probability that they will have a colorblind son with normal fingers?1. What are the characteristics of X-linked recessive inheritance? 2. Why does a son never inherit his father’s defective X chromosome? 3. What is required for a woman to display a sex-linked recessive trait?3. Suppose color blindness is a X linked trait in humans. It is also recessive. A phenotypically normal woman has a father with color blindness. This woman marries a man with normal vision. What is the chance of their children being color blind? What is the chance of their daughters being color blind?