The Allele D Codes for Right-Handed Coiling in a Species

question 20

Multiple Choice

The allele D codes for right-handed coiling in a species of snail,while allele d codes for left-handed coiling.Assuming the proteins encoded by these two alleles are cytoplasmic determinants,if a dd female mates with a DD male,what percentage of offspring snails will develop shells that are left-handed coils?

• A)0%
• B)25%
• C)50%
• D)75%
• E)100%

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Definitions:

Tracheids

Long, narrow water-conducting cells found in the xylem of vascular plants, contributing to the transport of water and minerals.

Vessel Elements

Components of the xylem in plants, responsible for conducting water and minerals from the roots to the rest of the plant.

Developing Root

The growth phase of a plant's root system which involves the formation, elongation, and differentiation of root cells and structures.

Developing Fruit

The growth phase of a fruit from fertilization of the ovary in plants to maturity, involving physiological and biochemical changes.