COLECUL E
III. Germ Layers - differentiated tissue layers in the embryos of all animals except
which have no tissues.
A. endoderm -
germ layer: give rise to lining of digestive tract;
respiratory system; urinary bladder; digestive organs; liver; many glands
B. mesoderm-
germ layer: give rise to most of the skeleton;
muscles; circulartory system; reproductive organs; excretory organs
germ layer: give rise to outer layer of skin;
C. ectoderm -
nervous system; and sense organs.

Which statement is not an accurate description of meiosis? a) meiosis produces offspring that are genetically diverse. b) meiosis produces offspring that are identical to the parent. c) in sexual reproduction half of the genetic material comes from the father (sperm) and half of the genetic material comes from the mother (egg). d) meiosis decreases the number of chromosomes by half so that when a sperm fertilizes an egg, the resulting zygote has the correct number of chromosomes.