In 1910, Charles Davenport opened the Eugenics Record Office at Cold Spring Harbor. He believed "feeblemindedness" was
A) not inherited.
B) a result of the influence of many genes.
C) caused by the environment.
D) the result of a single gene.
D) the result of a single gene.
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What happens during the process of gene flow in a population?
a. DNA of organisms in a population is randomly changed through mutation b. the allele frequencies vary between generations due to migration c. allele frequency slowly shifts towards the dominant alleles in the population d. allele frequencies randomly change from random mating through the generations
The intracellular preference for microtubules is at the________
Fill in the blank(s) with the appropriate word(s).
Which of the following describes a difference between prokaryotes and archaea?
Prokaryotes have cell walls composed of peptidoglycan, whereas archaea do not. Archaea can live only in water, and prokaryotes can live anywhere. Prokaryotes lack nuclei, whereas archaea do not. Prokaryotes reproduce asexually, whereas archaea reproduce sexually.
Which of these is associated with pre-embryonic development?
A. embryonic disk B. formation of the umbilical cord C. primary germ layers D. gastrulation E. morula