John is observing a few slides of a human embryo. the first slide shows a neural tube and the second just a compact mass of cells. which phases of human embryos are the slides?
a. first slide: blastula; second slide: gastrula
b. first slide: gastrula: second slide: neurula
c. first slide: neurula: second slide: morula

In familial hypercholesterolemia individuals homozygous for the allele causing the disorder completely lack receptors on liver cells that take up cholesterol from the blood stream. heterozygous have one-half the number of receptors while individuals homozygous for the normal allele are phenotypically normal. this is an example of a. epistasis b. complete dominance c. incomplete dominance d. codominance

Amouse that is homozygous for the dominant trait has the genotype . it has . a mouse that is homozygous for the recessive trait has the genotype . it has . image of fur color of mice

Which of these is not an obstical to the future of space exploration? fundingresearch ideas technologytime