Parallel venation is characteristic of eudicot leaves
____________________ Indicate whether the statement is true or false.
F, Netted
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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.
Four of the five methods listed below are used to
reduce the number of defective genes in a population. Select the exception. a. genetic counseling b. gene replacement c. mutagen reduction d. diet modification e. genetic screening followed by gene modification
During male sexual arousal ____
a. penile blood vessels are constricted b. blood flow out of the penis increases c. testosterone levels fall d. sensory nerve endings of the penis are inactivated e. blood flow to the penis is increased
The wings of insects and bats are ________ structures
Fill in the blank(s) with correct word