Asexual reproduction ________
A) creates individuals with unique combinations of genes
B) generates enormous genetic variation
C) is an effective way for animals to expand their population quickly and exploit an available environment
D) provides greater adaptability to changing environments
C
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If it is still maintained in the human population, hemoglobin Lepore must be selected for in evolution
B) There should also be persons whose hemoglobin contains two copies of the series of amino acids that is deleted in hemoglobin Lepore. C) Each of the genes in the hemoglobin gene family must show the same deletion. D) The deleted gene must have undergone exon shuffling. E) The deleted region must be located in a different area of the individual's genome.
Which fetal blood vessels carry oxygen-poor blood to the placenta?
Protein kinase A regulates glycogen metabolism by _______ glycogen synthase and _______ glycogen phosphorylase.
a. activating; activating b. inactivating; inactivating c. activating; inactivating d. inactivating; activating
The formation of the fertilization envelope requires an increase in the availability of _____
A) calcium ions B) hydrogen ions C) potassium ions D) sodium ions