Question

the two cream colored guinea pigs produced, in one case, 22 yellow. 47cream, and 19 white. What type of inheritance is this? II. Sex-linked Characteristics 12. In man, colorblindness, an inability to distinguish between red and green, is inherited as a sex-linked character on the X chromosome. It is recessive. If a colorblind man marries a homozygous normal woman what chance is there for the children of being colorblind? If a normal man marries a colorblind woman. where will colorblindness be found in the family? Why is it so commonly believed that women cannot be colorblind? 13. Let us assume that a colorblind man has a colorblind sister and his mother has normal vision. What is the genotype, as to color vision of this man's mother and of his father? What kind of color vision will his sons and his daughters have, and in what ratios, if he marries a woman identical in genotype to his mother 14. In man, hemophilia (failure of blood to clot) is a recessive and sex-linked character. A man and a woman, both normal in respect to blood-clotting, have (a) a hemophilie son who has a daughter who is normal, (b) a daughter who has normal blood and who has one hemophilic and one normal son, and (c) another daughter with normal blood who has five sons, all normal. What are the probable genotypes of grandparents, children, and grandchildren? 15. In the fruit fly, red eye is dominant to white eye, which is sex-linked. Specify the distribution of eye color (a) among the males and (b) among the females, derived from each of the following crosses a. white-eyed female x red-eyed male b. heterozygous red-eyed female x white-eyed male c. heterozygous red-eyed female x red-eyed male III. Multiple Alleles unners-photos 16. In man, blood groups are inherited on the basis of multiple alleles. Determine the genotypes of the following parents. a. Father group A, mother group B. All four groups are represented among the children. b. Father group AB, mother group B, 1/4 of children A, 1/4 AB, and 1/2 B. c. Both parents are A, 3/4 of the children are A, 1/4 type 0. 17. Suppose a father and a mother claim that they have been given the wrong baby at the hospital. The s to group B, the child to AB, one possible father to B. the other to A. Which man is the m probable father? Who would be the most probable father if the mother belongs to group B, the child to 0. the possible father to A, and the other to AB? 18. A man with normal vision and blood type B marries a woman with normal vision and blood type A They have two children, a color-blind boy with blood type A and a girl with normal vision and blood typ 0. What are the genotypes of the parents? 19. An Rh man, type A blood, marries an Rh woman, type B blood. Their first child is Rh' type A. Cou the second child be Rh, type O? IV. Dihybrid Crosses

Answer 1

Male - xy Fernale - xx XXXXY XXX IXY Fernales will be calweier of colaubladen Males will be fine and normal Thursday Male - XY Colourblind Fernale - XX YXY X Y Females will be carrier. Males will be diseased.

For a female to be colour blind it must be present on both of her X chromosomes. If a woman has only one colour blind 'gene' she is known as a 'carrier' but she won't be colour blind.