Based on molecular evidence, the ancestor of snakes had legs. How might you explain the loss of legs in modern snakes?
What will be an ideal response?
In a given environment, it was an advantage for the ancestors of modern snakes to be limbless. Due to natural selection, the legs became minimized over many generations to the point where they were eventually lost. So, just as traits can be gained by evolution, they can be lost if there is an evolutionary advantage to that change.
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From which of the following did humans
evolve?
a. chimpanzees b. monkeys c. gorillas d. orangutans e. none of these
In a water molecule, hydrogen atoms do not bind equidistant from each other.
True or False?
The zygote produces haploid cells by ________
Fill in the blank(s) with the appropriate word(s).
Which of the following is not involved in gene cloning?
A. "sticky" ends B. restriction enzyme C. dyes attached to nucleotides D. vector E. host cell