Indicate which of the following is true with regard to recessive alleles. (Select all that apply)
a. Their expression is masked int he presence of a dominant allele.
b. They are expressed only when present on both of the homologous chromosome.
c. They are more frequently observed in males than females.
d. They are more frequently expressed than other traits.
e. They mask the expression of other alleles.
a. Their expression is masked int he presence of a dominant allele.
b. They are expressed only when present on both of the homologous chromosome.
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Refer to the table above. Because the shark rectal gland functions only when ATP molecules are present, what can you infer about the movement of Na+, K+, and Cl-?
A) Movement of these ions from circulation into the rectal gland is an active process. B) Movement of these ions takes place from a region of higher concentration to a region of lower concentration. C) These ions move into the rectal gland down their concentration gradient. D) The rectal gland is unable to concentrate these ions.
What enzyme is responsible for unwinding the DNA during replication?
a. DNA polymerase b. DNA ligase c. helicase d. primase
The discarded theory of blending inheritance most closely resembles ____ inheritance
a. X-linked inheritance b. dihybridization c. codominance d. incomplete dominance
e. complete dominanceThe function of the sodium/potassium pump on an axon is to ________.
a. produce action potentials b. produce graded potentials c. make neurotransmitters d. pump sodium out and potassium into an axon