What macroevolutionary concept is considered controversial by some people?
A) the appearance of new traits in existing populations
B) the common descent of all organisms from one ancestral cell
C) the concept of species being subdivided into separate populations
D) the concept that genes can vary spontaneously
B
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The male part of a flower includes the:
a. carpel only b. stigma only c. style only d. anther only e. both the style and anther
The major way in which therapeutic cloning and reproductive cloning differ is that
a. reproductive cloning cannot in reality be accomplished, while therapeutic cloning can. b. therapeutic cloning seeks to provide cells and tissues for use in treatment of human diseases. d. reproductive cloning can only be done in plants, therapeutic cloning only in animals. e. reproductive cloning uses adult stem cells, therapeutic cloning uses embryonic stem cells. f. There is no difference: both processes seek to obtain a genetically pure individual.
In an animal that switches between sexual and asexual reproduction, when is sexual reproduction more likely to occur?
A) when conditions for survival are favorable B) when conditions for survival are unfavorable C) when males and females find each other D) What conditions favor sexual over asexual remains a complete mystery.
What are the DNA repair functions and the modes of activity of glycosylases and methyltransferases?
What will be an ideal response?