Human sperm production takes place within the
A. vas deferens.
B. epididymis.
C. penis.
D. seminiferous tubules.
Answer: D
You might also like to view...
The key hormone of childbirth is ____ , which is released from the posterior pituitary gland. It stimulates uterine contractions, which, in turn, stimulate more of it to be released
Fill in the blank with the appropriate word.
Most electron carriers are ________.
A. enzymes B. inorganic phosphate C. hydrogen D. coenzymes
In analyzing data for crosses involving two genes, Mendel discovered not only that these alleles separate from each other when examining one trait
but also that the alleles of a second trait will separate from each other without regard to those of the first trait. This observation was the basis of Mendel's law of ________. Fill in the blank with correct word.
Which of the following is a true statement concerning genetic variation?
a. it is created by the direct action of natural selection b. it arises in response to changes in the environment c. it must be present in a population before natural selection can act upon the population d. it tends to be reduced by the processes involved when diploid organisms produce gametes e. a population that has a higher average heterozygosity has less genetic variation than on with a lower average heterozygosity