A gene may have many alleles, but a person has only two alleles for a gene, because
A) having more than two alleles is always lethal.
B) a gene can be altered in many ways, but a person has only two copies of any gene.
C) a genotype is haploid because of meiosis.
D) having more than two alleles unbalances the chromosomes.
B) a gene can be altered in many ways, but a person has only two copies of any gene.
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A molecule or anything else that transports new genes into a cell is called a
(a) vector. (b) plasmid. (c) restriction enzyme. (d) bacterium.
If the multiregional hypothesis of human origins is correct, modern human populations last shared a common ancestor around ____ years ago. If the out-of-Africa hypothesis is correct, we last shared a common ancestor around ____ years ago
Fill in the blank with the appropriate word.
In skeletal muscle contraction, which of the following must be moved to the grooves in the actin
double helix to uncover the crossbridge binding site?
a. troponin b. Ca2+ c. tropomyosin d. ATP e. acetylcholine
Ice is less dense than water. This is significant in nature because:
1.The surface of a pond is colder than its depths since it has contact with air. 2.If ice formed from the bottom up, all aquatic life would die out each winter. 3.Water on top of ice would keep fish from their food source. 4.Ice could form at any time the temperature was below 32 degrees F.