A Researcher Has Developed Two Stains for Use with Seed

question 29

Multiple Choice

A researcher has developed two stains for use with seed plants. One stains sporophyte tissue blue; the other stains gametophyte tissue red. If the researcher exposes pollen grains to both stains, and then rinses away the excess stain, what should occur?

• A) The pollen grains will be pure red.
• B) The pollen grains will be pure blue.
• C) The pollen grains will have red interiors and blue exteriors.
• D) The pollen grains will have blue interiors and red exteriors.
• E) Insofar as the pollen grains are independent of the plant that produced them, they will not absorb either stain.

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Definitions:

Selective Attrition

The process by which participants drop out of a study over time, potentially leading to biased results if the departures are not random but related to the study's characteristics.

Long-term Studies

Research investigations conducted over extended periods of time, often years, to track changes or developments in subjects or phenomena.

Random Assignment

A method used in experiments to evenly distribute individuals across various treatment groups, ensuring that each group is similar at the start of the study.

Cohort

A group of individuals sharing a common characteristic, typically shared within a defined time frame, often used in studies to compare changes over time or across different groups.