The Old Order Amish in Lancaster County is descended from one man and woman and has an unusually high

frequency of a recessive allele that causes Ellis-van Creveld syndrome. This is an example of ____.



a. a bottleneck
b. mutation
c. a founder effect
d. gene flow
e. genetic drift


ANSWER: c

Biology & Microbiology

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Which of the following is a true statement about cycads?

a. Cycads can be pollinated by beetles. b. Cycads are the most common gymnosperm. c. Cycad leaves are a source of ephedrine. d. Cycads have only one surviving species.

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Group I introns, such as those found in Tetrahymena, are unique in that they are excised from mRNA by a protein-driven catalytic reaction

Indicate whether the statement is true or false

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Assume that a cross is made between two organisms that are both heterozygous for a gene that shows incomplete dominance. What phenotypic and genotypic ratios are expected in the offspring?

What will be an ideal response?

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