2. 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.
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- 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?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?4. The ruffed chicken has an under-chin wattle. A smooth wattle (S) is dominant over a wrinkled wattle (s). A red wattle (HR) is incompletely dominant with a white wattle (HW) so that an individual with HRHW will have a pink wattle. A chicken with a wrinkled red wattle is mated to a homozygous chicken with a smooth white wattle. What is the genotype and phenotype of the chicks?
- 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 hair1. In humans, the allele for normal blood clotting, H, is dominant to the allele for hemophilia, h. This is a sex-linked trait found on the X chromosome. A woman with normal blood clotting has four children: a normal son, a hemophiliac son, and two normal daughters. The father has normal blood clotting. What is the genotype for each member of the family?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.
- 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.1. If one parent is homozygous dominant for a trait, that parent's genotype might be GG. If the other parent is homozygous recessive for the same trait, that parent's genotype would be gg. What are the possible genotypes of their offspring? b. How many different phenotypes might we possibly see in their offspring? 2. If a male is homozygous dominant for a trait, that parent's genotype might be DD. If the female is heterozygous for the same trait, her genotype would be Dd. a. How many genetically different sperm can the male produce? b. Using a Punnett square, determine the expected genotypic ratios of their offspring. What are the expected phenotypic ratios? 3. In garden peas, the gene for red flowers (R) is dominant over the gene for white flowers (r). If pollen (cells containing sperm nuclei) from the anther (male reproductive organ) of a homozygous red-flowered plant is added to the pistil (female reproductive organ containing the egg) of a white- flowered plant: a. c. What would be…1. In humans, brown eyes (B) are dominant over blue (b). A brown-eyed man marries a blue-eyed woman and they have three children, two of whom are brown-eyed and one of whom is blue-eye a. Draw the Punnett square that illustrates this marriage b. What is the man's genotype? c. What are the genotypes of the children?
- 3. In humans, brown eye colour (B), is dominant over blue eye colour (b). a. What are the phenotypes of the following genotypes? In other words, what colour eyes will they have? BB bb Bb b. Tom is a brown-eyed man, whose mother is blue-eyed. He marries Freda, a blue eyed woman whose father has brown eyes. From this information, deduce: i. The genotypes of Tom and Freda ii. The genotypes of Tom's mother and Freda's father. iii. Given what you have deduced so far, what colour eyes would you predict Tom's father to have? iv. Tom's brother George has blue eyes. Using this additional information, deduce the genotype of their father. Ensure you explain your answers throughout.1. Given the karyotype shown here, is this a male or a female? What would the genotype/phenotype of this individual be?8. Consider the following phenotype for hemophilia, a recessive X-linked blood clotting disorder, in decendents of Queen Victoria. Victoria is thought to have been a carrier for the recessive hemophilia allele. What is the probability that Princess Irene is also a carrier? Albert Victoria (1819–1901) Edward Empress Victoria Leopold Princess O O L Duke of Alice Helena Beatrice II of Hesse Christian Albany Kaiser George Princess Frederick (Alexandra) Victoria Leopold Maurice Eugenie Alice Wilhelm II V Irene Alix Tsarina of Athlone Nikolas II (wife of Alfonso XIII)