Choose the One Best Answer for Each Numbered Item

Multiple Choice

Choose the one best answer for each numbered item.
-Gray crescent

A) Visible marker of the site where an amphibian's body axis will be established and where gastrulation will begin
B) The formation of three embryonic tissue layers
C) The fusion of male and female nuclei
D) The entire body divides transversely; each half grows and regenerates the missing part
E) Selective gene expression results in different cell types
F) Subdividing of the zygote by mitosis; no growth occurs
G) Region of zygote that has less yolk and is pigmented
H) An embryonic stage of development that has three primary tissue layers before organogenesis begins
I) The formation of organs
J) One body part develops in response to signals from an adjacent part
K) The growth, shaping, and spatial coordination of tissues and organs so that a predefined pattern of the whole organism results
L) Programmed cell death, as occurs in the formation of the mouse paw