The primary purpose of meiosis is to ________ the number of chromosomes; meiosis also generates ________ in the resulting cells
Fill in the blank(s) with correct word
reduce or halve; genetic variation
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In general, the more narrow a species’ habitat tolerance the larger the range of that species.
Indicate whether the statement is true or false.
Peter and Rosemary Grant study natural selection in finches on the Galápagos Islands. They have hypothesized that dry condition produce larger seeds and may result in larger beaks in succeeding generations of finches. The figure below shows their data from 1976 and 1978. The y-axis is the number of birds measured and the x-axis is the beak depth. Do their data support their hypothesis and why?
A. Yes; because there were more birds measured in 1978 after the drought, therefore they must have been able to get food and reproduce.
B. Yes; because the average beak depth of birds in the population increased from 8.8mm in 1976 to 9.8mm in 1978.
C. No; because even though more birds were measured in 1978, the beak size of the upper range was smaller.
D. No; because in 1976, before the drought, the largest beak depth was still 11.3mm.
E. No; more data would be necessary to show a support of their hypothesis.
The embryo is designated a fetus by which week of pregnancy?
a. eighth b. twelfth c. sixteenth d. twentieth e. twenty-fourth
In general, when filtration pressure increases, volume of filtrate will
A. increase. B. decrease. C. be unaffected.