In populations where individuals with extreme values of a trait have the highest fitness, the average value of the trait may not change, but the amount of variance in the trait does increase over time. This set of circumstances is known as ________
[two words] Fill in the blank(s) with correct word
disruptive selection
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A bryologist (a scientist that studies mosses, and their allies) gives a lecture to your biology class. In her lecture, she makes a reference to fern reproduction. She says, "Fern spores germinate into ____."
A. gametophytes, which are often heart-shaped and have rhizoids that anchor the fern to the substrate B. gametophytes, which are often heart-shaped and have roots that anchor the fern to the substrate C. sporophytes, which are often heart-shaped and have rhizoids that anchor the fern to the substrate D. sporophytes, which are often heart-shaped and have roots that anchor the fern to the substrate
Imagine that a section of heart muscle no longer has gap junctions. What do you think would be the result?
A. The effects would be minimal from this change. B. The ability of the heart muscle cells to contract would be severely compromised. C. The ability of the heart muscle cells to reproduce would be severely compromised. D. The ability of the heart muscle cells to coordinate their contractions would be severely compromised.
Which of the innate defense mechanisms can lyse bacteria and mark cells for phagocytosis?
What will be an ideal response?
Amoebas move from place to place by means of their
A. pseudomonads. B. plasmodia. C. cysts. D. sporocarps. E. pseudopods.