CH_1_2_3_practice_questions_for_EXAM_1

CH_1_2_3_practice_questions_for_EXAM_1 - For additional M/C...

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For additional M/C practice questions, use the website from the book PRACTICE PROBLEM-BASED QUESTIONS 45. The secretor trait in humans enables the A and B red blood cell antigens to be secreted in body fluids, including saliva and semen. The dominant Se allele causes the A and B antigens (if present in red blood cells) to be secreted in water- soluble form; the se allele results in no secretion. The secretor locus assorts independently of the ABO locus. A secretor man with type A blood marries a non-secretor woman with type B blood and their first child is a non-secretor with type B blood (child is typed out using blood). Which one of the following four statements (a-d) about this couple, if any, is incorrect ? a. the man MUST be heterozygous at both the ABO gene and the secretor gene b. the probability that their next child will be a non-secretor is ½ c. their first child must be heterozygous at both the ABO gene and the secretor gene d. ignoring the B antigen, the probability that their next child will secrete the A antigen is 1/4 46. Which one of the following five theoretical matings would produce the largest number of different five-locus genotypes among the offspring? a. Aa bb Cc Dd Ee X aa BB cc Dd ee b. AA bb Cc dd ee X aa BB cc Dd ee c. Aa bb Cc Dd EE X aa Bb cc DD Ee d. Aa bb Cc Dd Ee X aa BB cc Dd Ee e.
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CH_1_2_3_practice_questions_for_EXAM_1 - For additional M/C...

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