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
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The gametophyte is green and nutritionally independent in
A. mosses, liverworts, and ferns. B. angiosperms. C. gymnosperms. D. tracheophytes. E. seed plants.
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.
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
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?