Although sexual reproduction has a higher metabolic cost than asexual reproduction, many organisms use it. Why is it adaptive?
What will be an ideal response?
Asexual reproduction produces genetically identical offspring. This is fine as long as the environment is unchanging. Sexual reproduction leads to variation, which is important for adaptation to a changing environment. Genetic variation allows for the development of new traits.
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The leading hypothesis for the origin of the jaw proposes that ______.
A. it resulted from mutations in the developmental regulatory genes that determine the morphology of the rudimentary vertebral elements B. it first occurred in the hagfish and the lamprey C. it first occurred in the early tetrapods D. it resulted from mutations in the developmental regulatory genes that determine the morphology of the gill arches
This emerging field looks at when, where, and how much mRNA is expressed from a gene.
A. genomics B. transcriptomics C. proteomics D. cloning technology
Which of the following is a K-strategist?
A. moths B. grizzly bears C. bacteria D. mosquitoes
A purine or pyrimidine that differs in chemical structure from those normally found in DNA or RNA is called a(n)
____________________. Fill in the blank(s) with the appropriate word(s).