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SEX-LTNKED TNHERTTANCE I- ln cats, the genotype BB is black, Bb is calico (ortortoise shell), and bb is yellow. The gene is on the X chroinosome (and ir.obviously codominant). A.calico female is crossed with a black male. What offspring would be expected? Would you expect to find any calico males? whv? 2- ln humans, color bllndness is due to a sex-linked recessive, while blue eyes are due to an . autosomal recessive. Two brown-eyed parents with normal vision produce a blue-eyed colorblind son. What are the genotypes of the parents? 3- A blue-eyed woman whose father was colorblind marries a brown-eyed man whose mother was blue-eyed. What proportions of their sons would be blue-eyed and colorblind? 4. A normal visioned woman takes her daughter to an ophthalmologist for an examination. The doctor finds that the girl is colorblind. What does the doctor know about her father? What does she know about her mother? 5- ln humans, hemophilia A, the "bleeders disease" in which the time required for blood to clot greatly prolonged, depends upon the recessive allele of a sex-linked gene. ln the fbllowing questions, let X = normal clotting ti.me and Xh : the allele for hemophilia. is a. A man ',vhose father . :. b. c. 5. was hemophilic, but whose own blood clotting time is normal, marries a normal woman with no record of hemophilia in her ancestry. What are the chances of hemophilia in their children? A woman whose father was hemophilic, but whose own blood clotting time is normal, marries a normal man. What are the chances of hemophilia in their children? What is the chance of hemophilia among the sons of a dar.rghter of the marriage in the previous question if she marries a normal man? (l love that sentencel). lf she marries a hemophiliac? A tortoise shell cat (calico) has a litter of eight kittens: one yellow male, two black males., two yellow females, and three calico females. Assuming there is a single father for the lit[er, what is his probable color? 7. That reminds me - did you hear about the cat who swallowed a ball of yarn? She had mittensl 8. A black cat has a lit[er of seven kiftens: three black males, one black female and three calico females. Comment on the probable paternity of this litter. 9. A yellow cat has a litter of four kittens: father for the litter, what one yellow and three calico. Assuming there yellow kitten? is the sex of the is one ' for non-rolling' The gene for The gene for rolling your tongue is iominant to the.gene and is sex-linked- The Rh+ factor in hemophiria is recessive to the gene for normar brood crotting the blood is dominant to the Rh- faclor and Rh- blood' His sister Tillie Little lonny TifFenbroom cannot rolr his tongue, has hemophilia has Rh- blood' can roll her tongue, does not have hemophilia' and not have hemophilia and has Rh+ Jonny and Tillie's father, Tyrone, can roll his tongue' does of course she has normal blood blood. Mrs. Tiffenbroom (Magnolia) cannot roll her tongfue, and has Rh+ blood' clotting (or she would have died in .iifOUirth or before), What are the genotypes of Jonny's parents? chird will be a boy who can roii the probabirity that Tyrone and Magnoria's next tongue, has normal blood clotting and Rh+ blood? what his is Actuallv,Mr.andMrs.Tifienbroom'snextchildwasagirl'whatisth.eprobabilitythatthisgirl blood clotting and Rh- blood? not be able to roll her tongue; would have normal .would