Sexual selection typically results in sexual dimorphism, a situation in which ________
a. one male mates with many females
b. one female mates with many males
c. plants secrete scents that mimic insect sex hormones
d. the males and females of a species show distinct phenotypic differences
d
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Muscles aid the flow of venous blood
Indicate whether this statement is TRUE or FALSE.
Crystallization of tobacco mosaic virus was accomplished by
A. Berkley. B. Stanley. C. Iwanowsky. D. Twort.
In mammals, females have two copies of the X chromosome, whereas males have only one copy. Dosage compensation is accomplished in mammals by:
A. females inactivating the X chromosome from the mother in all the cells. B. males inactivating the X chromosome from the father in all the cells. C. females expressing the X-encoded genes at 2 times the level of the male. D. males expressing the X-encoded genes at half the level of the female. E. females possessing a randomly inactivated X chromosome in all cells.
A truck driver is transporting a load of unripened bananas in an air-tight vehicle, and decides to stop and eat an apple
He also checks on his cargo, opening the back of his truck and walking around the unripened bananasâ€"all while still snacking on his apple. When he makes his final delivery, he opens the back of his truck to find that all of his bananas have ripened. Why? Select all correct choices. A. Opening the back of the truck exposed the bananas to oxygen. B. Exposure of the bananas to the apple (and its ethylene) instigated their ripening. C. The bananas would naturally ripen over time, even in an air-tight environment. D. Opening the back of the truck exposed the bananas to light of red wavelengths.