Why is the clade in which derived traits evolve the minimum number of times favored? What will be an ideal response?
The evolution of a trait is a rare event, based on selective pressure and luck. The odds of a given event
happening repeatedly is far less than it happening one time. As a result, minimizing the number of
times derived traits are required to have evolved increases the likelihood of the clade.
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Histone modification occurs only during early development
A. true B. false
A model organism called Caenorhabditis elegans (a soil nematode) has been used to study cell signaling during development because of its simplicity. For example, a structure such as the vulva arises from only three cells, which are called ____ cells
Fill in the blank with the appropriate word.
Which of the following anatomical sites being tested or are targets for future gene therapies?
Collectively, the male testes and female ovaries are known as the ____________
Fill in the blank(s) with the appropriate word.