Syndactyly, a Congenital Abnormality in Which Webbing Is Present Between

question 46

Multiple Choice

Syndactyly, a congenital abnormality in which webbing is present between fingers and toes, can be corrected after birth. In utero, the cells comprising the webbing failed to undergo

• A)differentiation.
• B)gastrulation.
• C)apoptosis.
• D)convergent extension.
• E)morphogenesis.

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Definitions:

Ovulation

The phase in the female menstrual cycle during which a mature egg is released from the ovary, making it available for fertilization.

Cleavage

The process of cell division in the very early embryo that leads to the formation of the blastula.

Blastocyst

A thin-walled, fluid-filled sphere containing an inner mass of cells from which the embryo will develop; is implanted into the uterine wall during the germinal period.

Blastocyst

An early stage in human embryonic development, a hollow sphere of cells formed after several days of cell division following fertilization.