What is Muller's Ratchet theory?
What will be an ideal response?
The geneticist Herman Muller pointed out in 1965 that asexual populations incorporate a kind of mutational ratchet mechanism-once harmful mutations arise, asexual populations have no way of eliminating them, and they accumulate over time, like turning a ratchet.
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Some heterotrophic organisms actually contain vestigial chloroplasts
A. true B. false
Before zygotic genes become active, the stages of animal development are directed by the ____
a. environment b. cytoplasmic determinants of the egg c. cytoplasmic determinants of the sperm d. cytoplasmic determinants of the egg and the sperm
e. zygote nucleusDiatoms are characterized by ____, and are the source of economically useful_____
a. calcium carbonate shells; ozone b. calcium carbonate sheaths; petroleum c. silica shells; diatomaceous earth d. silica sheaths; limestone e. silica carbonate shells; diatomaceous earth
How are cellulose and starch similar and how do they differ?
What will be an ideal response?