If the multiregional hypothesis of human origins is correct, modern human populations last shared a common ancestor around ____ years ago. If the out-of-Africa hypothesis is correct, we last shared a common ancestor around ____ years ago
Fill in the blank with the appropriate word.
2 million, 200,000
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In Drosophila, the sex of an individual is determined by
A. 1 pair of alleles. B. the number of X chromosomes. C. the number of Y chromosomes. D. 1 pair of autosomes. E. 2 pairs of alleles.
A gene that no longer has any function is called
A. broken. B. a terminal gene. C. a pseudogene. D. negatively selected. E. a gene with a stopped molecular clock
Which of these actions will reduce the rate of diffusion?
a. increasing the temperature b. increasing membrane surface area c. increasing membrane thickness d. increasing the concentration gradient
What characteristics of flat worms allow them to use diffusion to excrete waste materials and take up oxygen (and for some kinds, to absorb nutrition from their hosts)?
What will be an ideal response?