In Support of the Topographic-Gradient Hypothesis,it Has Been Shown That

question 35

Multiple Choice

In support of the topographic-gradient hypothesis,it has been shown that

• A) axons do not grow out from the retinas until the retinas are fully grown, which is why babies have disproportionately large eyes.
• B) axons do not grow out from the retinas until their target structures (e.g., optic tectums) are fully grown.
• C) retinas and optic tectums always grow in precise proportion to one another.
• D) the synaptic connections originally formed by retinal ganglion cells on the optic tectums gradually shift as both the eyes and optic tectums grow at different rates during development.
• E) both A and B

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Definitions:

Stillbirth

The delivery of a child who is not alive, occurring in less than 1 delivery in 100.

Sudden Infant Death Syndrome

A sudden and unexplained death of a seemingly healthy baby, usually during sleep, in the first year of life.

Fallopian Tube

Part of the female reproductive system, a pair of tubes along which eggs travel from the ovaries to the uterus.

Sperm

Sperm are male reproductive cells necessary for the fertilization of a female's egg during sexual reproduction.