To analyze genetic variation in populations, one approach is to consider the frequency of alleles. When calculating an allele frequency for a diploid species, how many alleles are present for each gene?

A. 1
B. 2
C. 4
D. 4
E. It depends on whether the individual is heterozygous or homozygous.


B. 2

Biology & Microbiology

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The primary interest of genetic research into stem cells is the desire to be able to clone a human being

Indicate whether the statement is true or false

Biology & Microbiology

The function of “A” is to

a. digest the endosperm. b. protect new leaves as the seedling grows through soil. c. secrete hormones that cause flowering. d. absorb pheromones secreted by other seedlings. e. do none of these.

Biology & Microbiology

Which of the following features of how seedless land plants get sperm to egg are the same as for some of their algal ancestors?

A) Conjugation tubes are formed between sperm and egg cells. B) Packets of sperm are delivered by wind to the eggs. C) Aquatic invertebrates carry sperm to eggs. D) Flagellated sperm swim to the eggs in a water drop.

Biology & Microbiology

Which bacteria produce the botulism toxin?

a. Clostridium b. Salmonella c. Escherichia d. Staphylococcus

Biology & Microbiology