3. Red-green color blindness (b) is a recessive sex-linked trait. A colorblind male marries a normal female. Their daughter is colorblind. a)What are the genotypes of both parents and the daughter? b) Can a colorblind father have daughters who are not colorblind? Explain.
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- 3. STATEMENT: Color-blindness is due to a sex-linked recessive gene. A colorblind man marries a normal-visioned woman and they have a colorblind daughter. a) What is the genotype for the man, woman and the daughter? b) The couple decides to have another child, what is the probability their child will be: i. Colorblind? ii. Have a daughter that has normal vision, no colorblindness? They know that they're having a son because they saw the sonogram with a little noticeable Schmeckle (Oscar Meyer weiner). iii.3. Pattern baldness is a recessive sex-linked trait. Jake has a full head of hair. His wife Jeannie is heterozygous for the pattern baldness gene. A) What is Jeannie's phenotype? Why? B) What are the chances that their children will have pattern baldness?4. Brown eyes are dominant over blue eyes. This is NOT a sex-linked trait. Cross a brown-eyed colorblind male (whose mother had blue eyes) with a normal blue-eyed female (whose father was colorblind). a) What is the genotype of the male? b) What is the genotype of the female? c) What is the probability of getting offspring that are blue-eyed carrier females? (Remember that a carrier is a female that carries one copy of the sex-linked allele, but does not have the disease.) d) What is the probability of getting offspring that are blue-eyed? e) What is the probability of getting offspring that are blue-eyed colorblind males? f) What is the probability of getting offspring that are brown-eyed carrier females? g) What is the probability of getting offspring that are blue-eyed normal males? h) What is the probability of getting offspring that are colorblind?
- 2) A man with a recessive sex linked allele for colour blindness marries a woman who has normal vision but is a carrier of the recessive allele. What proportion of the offspring would be expected to ...... a) be male b) have normal vision c) be colour blind5. In humans, one type of color-blindness, an inability to distinguish between red and green, is inherited as a sex-linked character on the X chromosome. It is recessive. a) If a color-blind man marries a homozygous normal woman, what chance is there for the children to be color-blind? b) A normal man marries a color-blind woman. Which, if any, of their children are likely to be colorblind? c) Why is it so commonly believed that women cannot be color-blind?Additional problems (Chapter 4 (Extension of Mendelian Inheritance): 1. In rabbits, coloration of the fur depends on alleles of the gene c. From information given in the chapter, what phenotypes and proportions would be expected from the following crosses: a) CC X cc b) Cc x Cc c) Cc x Ccch d) cc x cc 2. From the information given in the chapter about the ABO blood types, what phenotypes and ratios are expected from the following matings: a) type AB x type O b) Type AB x type B individual whose mother is type O c) Type O x Type A individual whose father is type O d) Type Ox type O 3. A woman with type AB blood type gave birth to a baby with type B blood. Two different men claim to be the father. One has type A blood and the other type B blood. Can the genetic evidence decide in favor of either? 4. You have been studying a trait that seems to be present in every generation within a particular family. Further, you have observed that every affected offspring has at least affected parent…
- 1. A) Apply the concept of sex linkage to explain why color blindness is more prevalent in men than in women. B) Mary is concerned that she may be a carrier for hemophilia, a sex-linked condition located on the X chromosome. Mary is married to John, who doesn't have hemophilia. Assuming Mary is a carrier, what are the genotype ratios expected for Mary and John's kids (specify for boys and for girls)? C) Mary and John have 2 boys, none of them has hemophilia. Can we use this fact as proof that Mary does not carry the allele for hemophilia? Explain your argument.14. ii) If Individuals #6 and #7 have another daughter what are the chances that she will be affected. 1 II IV a) The pedigree above shows the passing on of colorblindness. What sex is MOST likely to be carriers of colorblindness? b) Why does individual IV-7 (a female) have colorblindness? c) Why do all the daughters in generation II carry the colorblind gene? d) List two h generation colorblind males. 15. Explain sex linked inheritance with examples. 16. Explain what happens during these following sicknesses and why it happens? i) Sickle cell anemia i Hemophilia 17. What do you understand by the term "Multiple Alleles"? Define the followings: Trait true breeding cross P generation F1 generation monohybrid cross F2 generation dominant recessive law of segregation genotype phenotype homozygous heterozygous test cross dihybrid cross law of independent assortment pedigree autosomal recessive Punnett square autosomal inheritance autosomal dominant3)If both parents have the recessive phenotype, which genotypes are possible for their offspring? choose all that apply A)homozygous dominant B)heterozygous C)homozygous recessive D)more information would be needed
- 2)If an individual that is homozygous dominant for a gene has offspring with an individual that is homozygous recessive for that gene, which genotypes are possible for their offspring? choose all that apply A)homozygous dominant B)heterozygous C)homozygous recessive D)more information would be needed3) if a normal sighted male has children with a carrier woman a) what proportion of their daughters will have normal colour vision? b) what proportion of their sons will be colour blind?The allele for colorblindness is carried on the X chromosome and is recessive. A man, whose father was colorblind, has a colorblind daughter. 1. a) Is this man colorblind? How do you know? b) Where did he get his gene for colorblindness? c) Must the fathers of all colorblind girls be colorblind? Why?