Two forms of hemophilia are determined by genes on the X chromosome in humans. Assume that a phenotypically normal woman whose father had hemophilia is married to a normal man. What is the probability that their first daughter will have hemophilia?
A. 25
B. 0
C. 50
D. 100
Answer: B. 0
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One reason that diseases caused by dominant alleles remain in populations is that
A) they do not run in families. B) they often do not produce symptoms until a person has already had children. C) they affect more females than males. D) they are more curable than recessive diseases.
Within a gymnosperm megasporangium, what is the correct sequence in which the following should appear during development, assuming that fertilization occurs?
1. sporophyte embryo 2. female gametophyte 3. egg cell 4. megaspore A) 4 ? 2 ? 3 ? 1 B) 4 ? 1 ? 2 ? 3 C) 1 ? 4 ? 3 ? 2 D) 1 ? 4 ? 2 ? 3
Which of the following is used by some animals in finding their way (navigation)?
A. Sense of smell. B. Position of the sun. C. Detection of electromagnetism. D. All of these answers are true, since each is used by some animal.
Which of the following is an example of GALT?
A. lymph nodes B. spleen C. tonsils D. thymus gland E. appendix