In Drosophila, Germ Cells Develop from Pole Nuclei Isolated from the Rest

question 8

Multiple Choice

In Drosophila, germ cells develop from pole nuclei isolated from the rest of the embryo at the posterior end. How are they "protected" from the effects of posterior concentrations of zygote-produced mRNAs and proteins?

• A)Their genes have unresponsive promoters.
• B)The cytoplasm at the pole is separated by a compartmentalizing membrane.
• C)The pair-rule, gap, and segmentation genes are not expressed in these cells.
• D)Homeotic genes in these cells are inhibited by zygotic genes from the mother.
• E)Paternal effects operate on the embryo only in the pole cells.

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Definitions:

Distribution of Scores

A representation, often in graph form, of how frequently different values occur within a set of data.

Median

The middle score in a distribution; half the scores are above it and half are below it.

Actor-Observer Effect

A psychological phenomenon where individuals attribute their own actions to external factors but others' actions to their personalities or dispositions.

Behaviour

The actions or reactions of a person or animal in response to external or internal stimuli.