If cell and tissue differentiation is controlled genetically, how can environmental factors play a role in determining the final phenotype?
What will be an ideal response?
Environmental factors may influence the timing and degree of expression of developmental genes, thereby influencing the phenotype.
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Geneticists construct linkage maps of chromosomes by
A) correlating a phenotype to an observable chromosomal abnormality. B) determining the number of crossovers between genes on different chromosomes. C) calculating the percent recombination between two genes on the same chromosome. D) observing the number of genes on a chromosome.
The Class Reptilia is a group of species that share a common ancestor, but does not include all of that
ancestor's descendants. It is therefore considered to be
a. monophyletic. b. polyphyletic. c. paraphyletic. d. an outgroup. e. a mosaic.
When is oxygen produced during the light reactions?
A) NADP+ is converted to NADPH. B) CO2 splits apart at the end of the light reactions. C) Electrons reach the end of the electron transport chain. D) Water is split to provide replacement electrons to chlorophyll.
Specimens are prepared for ________ microscopy using electron-dense stains
A) atomic probe B) bright-field C) confocal D) transmission electron E) scanning tunneling