You are a genetic counselor, and a couple comes to you with concerns that if they have a child
together it could have hemophilia. The man has an X-linked recessive form of hemophilia, but the
woman does not. Genetic tests reveal the woman is not a carrier for hemophilia. Which of the
following would be a correct thing to tell them?
a. Any child that they produce will have a 50% chance of having hemophilia.
b. All of their male offspring will have hemophilia, and each of their female offspring will
have a 50% chance of having hemophilia.
c. None of their offspring should have hemophilia, but all of their female offspring will be
carriers for hemophilia.
d. Each of their male offspring will have a 50% chance of having hemophilia, and while their
female offspring should not have hemophilia, they will each have a 50% chance of being
carriers.
e. All of their male offspring will have hemophilia, and while their female offspring should
not have hemophilia, they will all be carriers.
C
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Seed plants
(a) have alternation of generations. (b) are heterosporous. (c) develop a seed coat. (d) are all of the above.
How are the C4 and CAM pathways similar? How are they different?
What will be an ideal response?
Which pair of traits is homologous?
a. butterfly wings and bat wings b. the surfaces of bird and bat wings c. the skeletons of bird and bat wings d. butterfly wings and bird wings e. bird wings and bat wings
Which of the following statements about cellulose is false?
(a) Cellulose synthase enzyme complexes are integral membrane proteins. (b) An array of microtubules guides the cellulose synthase complex as it moves in the membrane. (c) The sugar monomers necessary for the synthesis of a cellulose polymer are transported across the plasma membrane. (d) Microtubules are directly attached to the outside surface of the plasma membraneto form tracks that help orient the cellulose polymers.