Identical Twins Are Possible in Humans Because ________

question 68

Multiple Choice

Identical twins are possible in humans because ________.

• A) cytoplasmic determinants are distributed unevenly in unfertilized eggs
• B) extraembryonic cells interact with the zygote nucleus
• C) early blastomeres can form a complete embryo if isolated
• D) the gray crescent divides the dorsal-ventral axis into new cells

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Definitions:

Dike Unit

It is a geological structure consisting of a major vertical or steeply-dipping sheet-like body of intruded igneous rock that cuts through older rocks.

Half-Lives

The period of time it takes for a radioactive substance to decrease to half its original amount.

Granite Unit

A large body of igneous rock with a granular and phaneritic texture, predominantly composed of quartz and feldspar.

Half-Lives

The time required for half the atoms in a sample of a radioactive substance to decay into a more stable form.