How do premating isolation mechanisms differ from postmating isolation mechanisms?
What will be an ideal response?
Premating isolation mechanisms prevent mating from ever occurring, whereas postmating isolation mechanisms occur after mating and prevent the hybrid offspring from passing on its genes.
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Filopodia and lamellipodia are associated with which cytoskeletal element?
a. microfilaments b. microtubules c. intermediate filaments d. chromatin e. cellulose. microtubules.
Growth factors such as platelet-derived growth factor function in:
A. autocrine signaling. B. paracrine signaling. C. endocrine signaling. D. juxtacrine signaling.
A larynx is found at the beginning of each insect trachea
Indicate whether the statement is true or false.
If nondisjunction occurs during meiosis,
a. the resulting sex cells will be heterogametes. b. one-half of the resulting cells will exhibit trisomy and the other half monosomy. c. diploid cells will be produced. d. all gametes would lack a chromosome and these gametes would be infertile. e. none of the gametes will be capable of achieving fertilization.