In the figure above, a new beneficial allele, B, arises on a chromosome containing the ordered loci A, b, C, D, and E, depicted in the top panel
After reproduction, those chromosomes possessing the B allele increase in frequency. Over time, recombination breaks up the association of the B allele with the A, C, D, and E allele. The first pair of allele combinations to be broken up will be:
a. B and A.
b. B and C.
c. B and D.
d. B and E.
e. All will break up at an equal rate.
D
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Fetal hemoglobin carries ________ percent more oxygen than adult hemoglobin.
A) 5 to 10 B) 20 to 30 C) 50 to 60 D) 80 to 90
Microtubules that originate at opposite centrosomes and interdigitate near the cell's equator without attaching to chromosomes are the
A) kinetochore microtubules. B) polar microtubules. C) astral microtubules. D) interdigitating microtubules.
Deformities in frogs are thought to be related to ________
a. pesticide contamination b. infections of a parasitic fluke c. excess nutrients in water from agricultural runoff d. all of the choices
Which of the following hormones is mismatched with its producing gland?
A. pineal gland-melatonin B. ovaries-follicle-stimulating hormone C. thymus gland-thymosins D. ovaries-estrogen E. testes-androgens