Choose the one best answer for each numbered item.
A. Gray crescent
B. Gastrulation
C. Fertilization
D.
E. Differentiation
F. Cleavage
G. Animal pole
H. Gastrula
I.
J. Embryonic induction
K.
L. Apoptosis
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
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Systematists often use DNA sequencing in ______________, the study of the order of evolutionary events within a group sharing derived characters.
Fill in the blank(s) with the appropriate word(s).
Use the concept of coevolution to explain the abundance of large mammals in Africa after the rise of humans but their
rapid demise in the Americas after the arrival of humans? What will be an ideal response?
Armadillos have a diploid chromosome number of 64. At prophase I, an armadillo's cell would have ____ tetrads present.
A. 56 B. 32 C. 78 D. 64
A group of cells having similar structure and function is called a(n)
A. population. B. organism. C. organ. D. tissue. E. organ system.