QUESTION 21 Males always inherit sex-linked traits from their fathers. True or F

Question

QUESTION 21 Males always inherit sex-linked traits from their fathers. True or False? O True O False QUESTION 22 What is the reason for the prevalence of the sickle-cell allele in African populations? O Sickled cells help prevent vitamin A deficiency among African populations O African populations tend to be at higher altitudes, and sickled cells better bind oxygen in these environments. O Sickled cells are better able to clot blood. O Heterozygotes have some resistance to the parasite that causes malaria. QUESTION 23 Imagine that smurfs live in widely separated groups and rarely interbreed, so geneticists know very little about them. On one occasion, two smurfs from different groups did mate. A big-footed, white smurf mated with a small-footed, blue smurf. Three offspring resulted: one big-footed and blue and two small-footed and blue. Which statement about the inheritance of color in smurfs is most likely to be correct? O Blue is dominant to white. O White is dominant to blue. O White and blue are codominant. QUESTION 24 All of the following are true regarding pedigree analysis EXCEPT that it: O documents the transmission of a genetic characteristic over two or more generations. O reveals whether a trait is dominant or recessive O is exclusively used to study the patterns of inheritance in dogs. O involves molecular biology QUESTION 25 Autosomal nondisjunction can result in XYY males. O Klinefelter syndrome. O trisomy X. O Turner syndrome. O Down syndrome.

Explanation / Answer

21. Males always inherit sex linked traits from their father is true.

22. The reason for the prevelance of the sickle cell allele in african population tend to be at higher altitudes, and sickled cells better bind oxygen in these evolution.

23. In which the most likely correct statement is blue is dominant to white.

24. Pedigree analysis involves molecular biology.

25. Autosomal nondisjunction can result in klinefelter syndrome, trisomy X, and down syndrome.

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