Which of the Following Statements About the Development and Function

question 10

Multiple Choice

Which of the following statements about the development and function of the visual system in animals is INCORRECT?

• A)The light-sensitive molecule for all light-sensing cells is the same, a derivative of vitamin A complexed with a protein called opsin.
• B)Eye defects arise from Pax6 mutations in many different organisms.
• C)Pax6 DNA and protein sequences are highly conserved in a wide range of organisms.
• D)Pax6 protein is so central to eye development that after transferring the mouse Pax6 to the fruit fly, the fly produces eyes similar to that of a mouse.
• E)The Pax6 gene evolved early and is shared among a wide range of animals, despite the structural diversity in their final adult eyes.

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Definitions:

Monozygotic (MZ) Twins

Twins that derive from a single zygote that has split into two; identical twins. Each MZ twin carries the same genetic code.

Dizygotic (DZ) Twins

Twins that derive from two zygotes; fraternal twins.

Canalization

A concept in developmental biology referring to the tendency of an organism to maintain developmental stability amidst genetic and environmental variations.

Genetically Determined

Traits or characteristics that are directly influenced by an individual's genetic makeup.