In order for speciation to occur, which of the following must be true?
A) There cannot be a barrier to gene flow between populations.
B) A population must be dispersed to an island.
C) The original population becomes polyploid.
D) There must be some genetic variability in the population.
Answer: D) There must be some genetic variability in the population.
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Hoverflies like to drop in at outdoor picnics to sample the sweets, but the reaction of humans is to flee the scene
because of the flies' uncanny resemblance to bees. Thus, the survival of hoverflies is enhanced by ____.
a. mimicry b. display behavior c. warning coloration d. chemical defenses e. camouflage
Which phenotypic ratio is likely to occur in crosses of two completely dominant, independently segregating gene pairs when both parents are fully heterozygous?
What will be an ideal response?
The presence of wings in butterflies, moths, bats, and birds is an example of _______.
A. Homology B. Homoplasy C. An ancestral trait D. A synapomorphy
When taken by pregnant women, ________ decreases the chance of neural tube defects in infants
A) folic acid B) vitamin C C) vitamin K D) calcium