4. In cats short hair is dominant to long hair. You have a short haired cat. How would you tell if it is homozygous dominant or heterozygous?
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- 10. In the video example, the sex-linked disorder was a recessive trait. However, sex-linked disorders can be dominant! (Conduct a search to see some of the sex-linked dominant disorders that exist). Sex- linked dominant disorders will show even if there is only one dominant allele present. Using the allele D to stand for a dominant sex-linked trait, show a cross with a woman who does not have a dominant sex-linked disorder (X*Xª) with a man that does. Will the disorder in this particular cross be more common in daughters or sons?7. Use a Punnett square to explain why a cross between two heterozygous individuals will result in offspring that exhibit both the dominant and recessive phenotypes.9. What is the principle of dominance? 10. If two parent's genotypes are Homozygous Dominant (Brown Eyes), and Homozygous Recessive (Blue Eyes), which of the phenotypes would the heterozygous offspring express, and why?
- 2. A person with a curly hair mates with a person having a straight hair. All their offspring have wavy hair (indicating incomplete dominance). What would be the result of a cross between two wavy haired individuals? Give the genotypic and phenotypic ratio.1. How many different types of gametes can be produced by an individual with the genotype Yy Ww Pp ee Bb? 2. If an individual with the genotype Yy Ww Pp ee Bb is crossed with another individual with the same genotype, what proportion of offspring will be homozygous recessive at all genes? 3. If an individual with genotype Yy Ww Pp ee Bb is crossed with an individual with the same genotype, what proportion of offspring will have the dominant phenotype for the four heterozygous loci?9. In fruit flies, eye color is carried on the X chromosome. The allele for red eyes is dominant over its recessive allele, white eyes. Cross a homozygous, red-eyed female to white-eyed male. white cefes red eyes What is the genotype of the male? What is the genotype of the female? X xxx xx Y XY XY Genotypes x' x X Y How many genotypes are possible among the offspring? How many phenotypes are possible among the offspring? What is the probability of getting offspring that are red-eyed males? What is the probability of getting offspring that are white-eyed males? What is the probability of getting offspring that are red-eyed females? What is the probability of getting offspring that are white-eyed females? Phenotypes red eyes white eyes
- 2. In cats, yellow coat color is due to a gene, b, and black coat color is due to its allele, B. The alleles b and B are sex-linked (i.e. are located on the X chromosome). Because of Barr body formation, the heterozygous condition results in tortoise shell colored cats (both black and yellow patches). a) What kinds of offspring would be expected from the mating of a black male with a yellow female? b) Of a yellow male with a tortoise female?2. If a woman who has no dimples (recessive) and is homozygous free earlobes (dominant) has children with a man who has dimples and has attached earlobes (heterozygous for both traits), what is the probability of them having each of the following types of children? (Fill in the Punnett Square and the blanks). Parents' genotypes X d. How many no dimples, not attached earlobes e. How many dimples, attached earlobes4. Brown eyes are dominant over blue eyes. This is NOTA sex-linked trait. Cross a brown-eyed colorblind male (whose mother had blue eyes) with a normal blue-eyed female (whose father was colorblind). Genotype of the male Genotype of the female Genotypes Phenotypes 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.) What is the probability of getting offspring that are blue-eyed? What is the probability of getting offspring that are blue-eyed colorblind males? What is the probability of getting offspring that are brown-eyed carrier females? What is the probability of getting offspring that are blue-eyed normal males? What is the probability of getting offspring that are colorblind?
- 4. Albinism is caused bya recessive al lele. A brown rabbit crossed with an albino rabbit produces 12 brown offspring. When the albino rabbit is crossed with a second brown rabbit, 7 brown and 5 albino offspring are produced. What is the best explanation for this genetic situation? Write the genotypes of each of the parents and their offspring. A First set of parents First set of offspring Cenng to ri Second set of parents e 1:s!! A A Second set of offspring Sbl13. 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 X3. In seals, the gene for the length of the whiskers has two alleles. The dominant allele (W) codes long whiskers and the recessive allele (w) codes for short whiskers. What is the probability of producing offspring that have short whiskers from a cross of two long-whiskered seals, one that is homozygous dominant and one that is heterozygous? Genotype: Phenotype: