Red-green color blindness is an X-linked recessive trait in humans. What is the probability that a
color-blind woman and a man with normal vision will have a color-blind daughter?
a. 100 percent
b. 75 percent
c. 50 percent
d. 25 percent
e. 0 percent
E
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The presence of genes encoding RubisCO enzymes in Methanocaldococcus jannaschii and a species of Pyrococcus indicates that the organisms
A) incorporate carbon dioxide via the acetyl-CoA pathway. B) incorporate carbon dioxide via the Calvin cycle. C) incorporate carbon dioxide via the reverse citric acid cycle. D) utilize molecular hydrogen as an electron donor in chemolithotrophic metabolism.
__________ species, which evolved in one place and
are present only in that habitat, are highly vulnerable to extinction. Fill in the blank(s) with the appropriate word(s).
spermatidWhich structure contains 46 chromosomes?
a. egg b. zygote c. secondary oocyte d. polar body e. spermatid
A variety of finch species within the Hawaiian Islands have acquired different types of beaks needed for utilizing specific food resources. What is the likely process by which these different species of finches came about?
A. vertical descent with mutation B. an accumulation of harmful genetic mutations C. horizontal gene transfer