A)A heterozygous offspring will have the dominant characteristic in the phenotype.
B)A homozygous offspring will have the recessive characteristic in the phenotype.
C)If a recessive trait does not appear in a family for two generations, the gene for it is no longer present.
D)If Mom and Dad both have blue eyes, the chance for a child of theirs to have brown eyes is only 50%.
E)If Mom and Dad both have brown eyes, the chance for a child of theirs to have blue eyes is 50%.
F)A trait is considered dominant when it is more common (frequent) in a population than its recessive counterpart.

A)The ectoderm gives rise to the nervous system.
B)Mesoderm forms most of the liver and pancreas.
C)Bones come primarily from endoderm.
D)The lungs are epithelial tissue from the ectoderm.
E)The stomach lining is an inside surface and is of endodermal origin.
F)Most organs have tissues from all three germ layers.

A)The amniotic sac surrounds the fetus and contains fluid.
B)The yolk sac provides the first nutrients for the embryo.
C)The chorion will form the maternal part of the placenta.
D)The first fetal blood cells are made by the amnion.
E)The embryonic membranes are not part of the fetus, but are made of fetal tissue
F)The yolk sac becomes a cushion for the embryo.