Which of the following is true about natural selection?
Select one:
a. It acts on genotypes rather than phenotypes.
b. It assures the survival of each fit individual.
c. On average, it favors the survival of young with adaptive characteristics.
d. It always selects for more complex forms.
e. It always selects for forms that are a mutated variation.
c. On average, it favors the survival of young with adaptive characteristics.
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Human development begins with fertilization, but the fertilized egg does not begin to divide until after it implants in the uterine wall
A. true B. false
Why is it that human males and females who are both heterozygous for the pattern-baldness gene have different phenotypes (males are bald, females are not bald)?
What will be an ideal response?
Active transport ________
A) uses ATP as an energy source B) can move solutes against their concentration gradient C) can involve the transport of ions D) all of the answer options
Colchicine is a toxin that binds to tubulin proteins and prevents microtubules from elongating. What effect might this have on dividing cells?
A. Replicated chromosomes will not be able to stick together, so sister chromatids will not properly sort into daughter nuclei. B. Cells will be able to complete mitosis, but cytokinesis will not occur. C. Chromosomes will not be able to condense, so mitosis will not occur. D. Sister chromatids will not be properly separated into separate daughter cells. E. The cell will not be able to move past the restriction point, so DNA will not be replicated.