Which of the following is a result of expression of both Hoxc6 and Hoxc8 genes in pythons?
a. A python's ribcage develops right behind its head, and limb buds or forelimbs develop.
b. A python's ribcage develops right behind its head, and no limb buds or forelimbs develop.
c. A python's ribcage develops right behind its head, and limb buds or hindlimbs develop.
d. A python's ribcage develops right behind its head, and hindlimbs or forelimbs develop.
Ans: b. A python's ribcage develops right behind its head, and no limb buds or forelimbs develop.
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What is the p value from this test? (Pick the most accurate choice.)
In Drosophila, singed bristles (sn) and carnation eyes (car) are both caused by recessive X-linked alleles. The wild-type alleles (sn+ and car+) are responsible for straight bristles and red eyes, respectively. A sn car female is mated to a sn+car+ male and the F1 progeny are interbred. The F2 are distributed as follows:
A) p> 0.5
B) 0.1
D) p< 0.05
E) p< 0.01
__________, or four-legged walkers, evolved from lobe-finned bony fishes. Fill in the blank(s) with the appropriate word(s)
Most of the ocean’s productivity occurs
a. in the open ocean b. in the intertidal zone. c. in the neritic zone. d. near hydrothermal vents. e. in the benthic province.
Recombinant chromosomes are created during crossing over events between ____________
a) sister chromatids of the same homologous pair during meiosis. b) non-sister chromatids of the same homologous pair during meiosis. c) non-sister chromatids of the same homologous pair during mitosis. d) sister chromatids of the same homologous pair during mitosis.