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- 1. In guinea pigs, black coat color (B) is dominant over white (b), and short hair length (H) is dominant over long (h). a) A guinea pig that is homozygous for black coat color and heterozygous for short hair is crossed with a black coat, long-haired guinea pig which had a white-coated mother. Indicate the genotypes of each parent, their gametes, and complete a Punnett square which shows the genotypes of all offspring. b) What is the probability of obtaining offspring with the following characteristics: i) black coat color and long hair ii) a female with white coat color and short hair2. In humans, widow's peak (W) is dominant over a continuous hairline (w), and short fingers (F) are dominant over long fingers (f). Two individuals with widow's peak and short fingers have a child with continuous hairline and long fingers. Determine the genotype of the parents.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.) (6) Assume that brown eyes are dominant = B, blue eyes are recessive = b. My first wife has blues eyes. I know I am homozygous dominant a. What is her genotype? b. What are her possible gamete genotypes? c. What is my genotype? d. What are my possible gamete genotypes? What genotype(s) do you expect of our offspring? Show your work (Punnett square is a good idea). e.1. In "Four o' Clock “plants, it's flower color is incompletely dominant. The red flowers are homozygous dominant, the white flowers are homozygous recessive, and the pink flowers are heterozygous. Show genetic crosses between the following Four O'clock parents, using the Punnett squares provided and indicate the genotypic and phenotypic % below: A. Red x white Genotypic %: Phenotypic %: B. White x Pink Genotypic %: Phenotypic %: C. Pink x Pink Genotypic %: Phenotypic %:9. Please determine whether the allele responsible for the trait is dominant or recessive. (A) (B) 1 2 10.For a cross between a female color blind carrier and a male color blind person, what is the probability for the female offspring to be color blind? What is the probability for the male offspring to be color blind? Please explain. 11.Consider the genetic map shown below AD Which two alleles have the highest recombination frequency? Which two have the lowest recombination frequency? O Focus ! 72°F DELL F5 F6 PrtScr Insert Hor FZ F8 F9 F10 F11 F12 23 %24 3. 4. 8 E R T
- 1. Windows peak (S) is dominant over straight hairline (s). Given that the mother has heterozygous gene pair for window's peak and the father has straight hairline. a. What is the genotype of the mother? b. What is the genotype of the father? * How many kinds of gametes can the mother produce? List them down. d. How many kinds of gametes can the father produce? List them down. e. Perform a cross using a Punnett square. f. Give the genotypic ratio of the cross g. Give the phenotypic ratio of the cross A 4.9. In the F2 Generation, both the male and female pea plants are heterozygous for round/wrinkles seeds. 1)Draw a Punnett square that shows this cross. 2)What are the possible genotypes? 3)What are the possible phenotypes? 10. In pea plants, the allele for smooth pods (P) is dominant over the allele for pinched pods (p). Construct a Punnett Square that shows a cross between an PP plant and an Pp plant. Predict what percent of the offspring are likely to have smooth pods. Essay: Is it possible for a son to inherit an allele on an X chromosome from his father? Explain why or why not.9. Make a pedigree for each of the following situations. For each individual, write the individual's genotype (when possible) next to the individual's symbol (e.g. O xty, I Gg): a. Two parents do not have cystic fibrosis and they have a daughter with cystic fibrosis and a son who does not have cystic fibrosis. The daughter grows up and she mates with a male who does not have cystic fibrosis. Their only child is a boy and he has cystic fibrosis. b. A man with hemophilia mates with a female without hemophilia. They have one son and one daughter. The daughter has hemophilia and the son does not have hemophilia. The son grows up, and he marries and mates with a female. Their only child is a boy, and he has hemophilia.
- 12. A. B. C. A certain type of migraine headache (M) is dominant to no migraines (m). What is the genotype of a man who has migraine headaches if his father did not have them? What is the genotype of a man who has migraine headaches if his mother did not have them? If a woman without migraines marries a man who is heterozygous for migraines, what would you expect for the genotypes and phenotypes of their children? If two people who are heterozygous for migraines marry and have children, what would you expect for the genotypes and phenotypes of the children.9. In fruit flies, the gene for tan body color (T) is completely dominant over the gene for ebony body color (t). The gene for red eyes is dominant over the gene for white eyes and is a sex-linked trait. A tan female with red eyes (heterozygous for both traits) is crossed with a homozygous ebony male with white eyes. A) Write out the genotypes of two parents. Remember that eye color is sex- linked! Female: Male: B) Set up and fill out a punnett square for this cross. C) What is the probability of producing a fly that is an ebony male with white eyes?7. In the guinea pig, one locus involved in the control of coat color may be occupied by any of four alleles: C (full color), ck (sepia), cd (cream), or c (albino), with an order of dominance of: C>ck > cd > c. In the following crosses, determine the parental genotypes and predict the phenotypic ratios that would result. a) Sepia x cream, where both guinea pigs had an albino parent b) Sepia x cream, where the sepia guinea pig had an albino parent and the cream guinea pig had two sepia parents c) Sepia x cream, where the sepia guinea pig had two full color parents and the cream guinea pig had two sepia parents d) Sepia x cream, where the sepia guinea pig had a full color parent and an albino parent and the cream guinea pig had two full color parents.