Platelets are derived directly from ____
a. lymphoid stem cells
b. megakaryocytes
c. erythrocytes
d. pluripotent stem cells
e. myeloid stem cells
ANSWER: b
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The production of gene families, such as the globin genes is the result of ________
A. inversions B. deficiencies C. gene duplications D. simple translocations E. None of the answers are correct
What happens to the inner diameter of the walls of the respiratory tract as it moves down from the upper conducting zone to the lower respiratory zone?
A) increases B) thins C) decreases D) no change E) thickens
Which statement about asexual reproduction is true?
a. The advantage of asexual reproduction is that it results in new gene combinations. b. Two parents are required for successful asexual reproduction. c. The process of meiosis takes place in the parent and results in four haploid cells. d. The offspring of asexual reproduction are genetically identical to the parent. e. Asexual reproduction requires the fusion of two haploid gametes.
In humans, if nondisjunction led to an individual with a genotype of XO, that person would
A. be male because each cell has only one X chromosome. B. not survive. C. be female because each cell lacks a Y chromosome. D. display both male and female characteristics.