Genetics 1. People with the sex-linked genetic disease, hemophilia, suffer from

Question

Genetics 1. People with the sex-linked genetic disease, hemophilia, suffer from excessive bleeding because their blood will not clot. Tom, Mary, and their 4 daughters do not exhibit symptoms of hemophilia. However, their son exhibits symptoms of hemophilia because: A) Tom is heterozygous B) Tom is homozygous C) Mary is homozygous D) Mary is heterozygous E) All of the above are equally likely What is the risk of having a child affected by disease with an autosomal recessive inheritance if both the mother and father are carriers for the disease? A) 0% B) 25% C)50% D) 75% E) 100% 2. 3. Which of the following observations would support the theory of maternal inheritance for the spunky phenotype? A) Spunky female x wild-type male progeny all spunky B) Wild-type female x spunky male progeny all spunky C) Wild-type female x spunky male-) progeny % spunky, wild-type D) Spunky female x wild-type male ? progeny ½ spunky)% wild-type E) Spunky female x wild-type male progeny all wild-type 4 Which cross must produce all green, smooth peas if green (G) is dominant over yellow (g) and smooth (S) is dominant over wrinkled (s)? A) GgSs x GGSS B) GgSS x ggSs C) Ggss x GGSs D) GgSs x GgSs E) None of the above The tall allele is dominant to the short allele. True breeding tall plants were crossed to true breeding short plants. The F1 plants were self-crossed to produce F2 progeny. What are the phenotypes of the F1 and F2 progeny? A) All F1 and 1/4 of the F2 are short B) All F1 are short and 1/4 of the F2 are tall C) All F1 and 3/4 of the F2 are tall D) All F1 are tall and 3/4 of the F2 plants are short E) None of the above 5. ??

Explanation / Answer

Question no 1: (D)

Question no 2: (B)

Question no 4: (a)

Question no 5: (C)

Question no 6: (C)

Question no 7: (A)

Question no 8: (C)

Question no 9: (B)

Question no 10: (B)

Question no 11: (C)

Question no 12: (D)

Question no 13: (D)

Question no 14: the options / question is wrong as all of the progeny will be black and spotted as per the conditions

Question no 15: (B)

Question no 16: (E)

Question no 17: (E) as the chromosomal theory of inheritance is the most accepted theory

Question no 19: (A)

Question no 20: (A)

Question no 21: (C)

Question no 22: (D)

Question no 24: (E) as only males are affected

Question no 25: (B)

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