11. In single-gene traits, natural selection can lead to which of the following?

A. Founder effect

B. Disruptive selection

C. Allele frequency change

D. Directional selection

What is happening during the pause phase when the heart is resting?

What is an example of a prokaryotic cell?

Which event is most likely to cause a widespread influenza outbreak? Answers A. the northern portion of the country is affected by winter-like weather patterns. B. People do not have immunity to a new strain of the influenza virus. C.

If you stick your hand in a bucket of ice water for a few moments you will most likely feel both cold and pain sensations. Which pathway, from the spinal cord to the brain, carries this information? A. Dorsolateral B. Primary somatosensory C.

What causes an individual moth to be black or white in color: its genes, its environment, or both?

Which sphere is home to the largest portion of animal life on earth

In a particular breed of cattle, the trait of not having horns (Pp) is dominant over having horns (pp). The Punnett square below shows a cross between parents with Pp and pp genotype. What percentage of offspring will be without horns? A. 0% B.

In a pond ecosystem, what generally happen over a long period of time? A) The pond will fill in, grasses and trees will grow there B) It will become deeper than a lake. C) The water will become stagnant and everything in the pond will die.

Which statements are part of Darwin's theory of evolution? Check all that apply. Organisms stay the same over time. Organisms change over time. All organisms have common ancestors. Only some organisms have common ancestors.

Plant and animal cells are different because * Plant cells do not have a nucleus or mitochondria Animal cells do not have DNA or ribosomes Plant cells do not have a cell membrane Animal cells do not have a cell wall or chloroplasts