In humans, the gene for normal vision (B) is dominant to the gene for color blindness (b). Color blindness is a sex-linked trait. Which of the following would be the genotype for a colorblind male? xoxb XBy XtY
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- 6. A man with X-linked colorblindness marries a woman with no history of ibba colorblindness in her family. The daughter of this couple marries a normal man noitenmot and ended up hone daughter, and their daughter also marries a normal man. This mont blast couple has already had a child with color blindness. do sri ni novig A) What is the chance that next child will be color blind? B) What is the chance that this last couple will have an affected daughter? (d #50x²50 (1. Given the karyotype shown here, is this a male or a female? What would the genotype/phenotype of this individual be?8. Identify the following. Gene found on Y chromosome but not X chromosomes Protein coded for by SRY gene Function of testis determining factor (TDF) Organ that secretes testosterone and Mullerian inhibiting factor (MIF) Hormone that promotes development of external genitalia along male line Protein that transforms Wolffian ducts into male reproductive tract organs Organ that develops in the absence of TDF SRY gene sex-determining region Y protein initiating male sex determination Testosterone
- 5. A man who is not bald married a non bald female whose mother is bald. A. What is the chance that the couple will have a bald son? B. What is the probability that the couple will have a bald daughter? What is the chance that the couple will have a nonbald daughter? C.3a. A father that is A+ has a child with a mother that is B+. If each parent carries the recessive i allele (aka the o allele) and each parent is heterozyogous for the Rh allele, what is the chance that they have a child that is O+?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 man, brown eyes (B) are dominant over blue eyes (b) and normal skin pigmentation (N) is dominant over albinism (n). A brown eyed, albino man whose mother had blue eyes and normal skin pigmentation and whose father was albino marries a blue eyed, normally pigmented woman whose father had brown eyes and was albino. (a) What is the woman's genotype? (b) What proportion of the couple's offspring would be expected to have brown eyes and normal skin pigmentation? (c) What proportion of the couple's offspring would be expected to have genotype Bbnn? (d) If the man were to marry a woman with the same genotype as his present father-in-law, what proportion of the offspring would be expected to have blue eyes and be albino? (e) If the woman were to marry a man with the same genotype as her present mother-in-law, what proportion of the offspring would be expected to be of genotype bbNN?8. The autosomal (not X-linked) gene for brachydactyly, short fingers, is dominant to normal finger length. Assume that a female with brachydactyly in the heterozygous condition is married to a man with normal fingers. What is the probability that(a) their first child will have brachydactyly?(b) their first two children will have brachydactyly?(c) their first child will be a brachydactylous girl?4. STATEMENT: A woman who has blood type B positive has a daughter who is type 0 positive and a son who is type A negative. a) What is the genotype for the woman, daughter, son and man? Woman Daughter Son Man Genotype b) The woman and the man surprising are having a third child. What are the possible genotypes and phenotypes for their third child?
- 10. XBXb represents : 1. A color blind female 2. A non colorblind female who is a carrier of the trait 3. A color blind male 4. A non colorblind maleAdditional problems (Chapter 4 (Extension of Mendelian Inheritance): 1. In rabbits, coloration of the fur depends on alleles of the gene c. From information given in the chapter, what phenotypes and proportions would be expected from the following crosses: a) CC X cc b) Cc x Cc c) Cc x Ccch d) cc x cc 2. From the information given in the chapter about the ABO blood types, what phenotypes and ratios are expected from the following matings: a) type AB x type O b) Type AB x type B individual whose mother is type O c) Type O x Type A individual whose father is type O d) Type Ox type O 3. A woman with type AB blood type gave birth to a baby with type B blood. Two different men claim to be the father. One has type A blood and the other type B blood. Can the genetic evidence decide in favor of either? 4. You have been studying a trait that seems to be present in every generation within a particular family. Further, you have observed that every affected offspring has at least affected parent…3 View the diagram of fertilization with the sex chromosomes shown below. Identify the disorder that an offspring would have if an egg cell that has an extra copy of the X chromosome were to be fertilized by a sperm cell. Determine the gender of the zygote. Describe the effects of the resulting condition. X 11x X Egg cell X X MI Y Zygote Y Sperm Cell