Which Statement About Embryonic Development Is True

question 31

Multiple Choice

Which statement about embryonic development is true?

• A) Determination is the process by which blastomeres differentiate into specific cell types.
• B) Preimplantation genetic diagnosis is possible in humans because they have regulative development.
• C) In Drosophila, pole cells are the last cells to become determined.
• D) Determination occurs later in species with mosaic development than in species with regulative development.
• E) If the cells of a roundworm embryo in the two-cell stage are separated, each will develop into a complete animal.

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Definitions:

Dependent Variable

The variable in experimental research that is expected to change as a result of manipulations to the independent variable.

Control Variable

A factor that is kept constant to accurately test the impact of an independent variable on a dependent variable in an experiment.

Placebo

A harmless substance with no therapeutic effect, used in controlled experiments to test the efficacy of treatments.

Control Group

In experimental research, a group of subjects who do not receive the treatment being tested, used as a benchmark to measure the effect of the treatment.