In small isolated populations, gene frequencies can fluctuate considerably. The term that applies to this circumstance is ________
A) genetic isolation
B) stabilizing selection
C) natural selection
D) allelic separation
E) genetic drift
Answer: E
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All major animal lineages were present in the seas by the end of the ________ period
a. Cambrian b. Cretaceous c. Quaternary d. Carboniferous
The __________ is the pelvic girdle, pectoral girdle, and paired limbs. Fill in the blank(s) with the appropriate word(s)
When chromosomes fail to separate at either the first or second meiotic division this
A. is known as crossing over. B. results in a sperm or egg cell with an abnormal number of chromosomes. C. is known as translocation. D. results in a failure to produce gametes. E. results in arrest during meiosis.
The structure of the Drosophila gene, called Tinman, is similar to a gene in humans that also _____
A) promotes ear development B) specifies the location of the heart C) determines structures in the eyes D) specifies limb elongation points