X-linked genes in female mammals often demonstrate ________
A) phenotypic mosaicism
B) underrepresentation in the genome
C) nonrecombination during meiosis
D) heterochromatin formation
E) incomplete dominance
Answer: A
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A DNA microarray is ____
a. used for gel electrophoresis b. used identifying fragments of genes using a labeled probe c. linked to self-replicating vectors to create recombinant DNA molecules d. a series of long mRNA sequences placed on a solid support and has several uses e. a series of short nucleotide sequences placed on a solid support and has several uses
If a couple is planning on having three children, what is the probability that only one will be male?
a. 0 b. 1/4 c. 3/8 d. 1/2 e. 3/4
The Ixodes tick can infect humans with Borrelia burgdorferi during which stage(s) of its life cycle?
A. only as a larva B. only as a nymph C. only as an adult D. either as a nymph or an adult E. either as a larva or a nymph
This figure shows the geological history of North and South America and the closing of the Isthmus of Panama
If a single species were distributed throughout the region indicated by the arrow in the left-most panel, and today is found as two separate species, one in the Atlantic Ocean and one in the Pacific, would this be more likely to be an example of allopatric speciation by the dumbbell model or the peripheral isolate model? Why? What will be an ideal response?