Question: 1.Which of the following about embryonic development is false? Select one: a. Preimplantation gen…

1.Which of the following about embryonic development is false?
Select one:

a. Preimplantation genetic diagnosis is possible in humans
because they have regulative development.

b. Determination occurs later in species with mosaic development
than in species with regulative development.

c. In frogs, germ cell plasm may contain inhibitors of
transcription and translation that prevent differentiation into
cells other than germ cells.

d. In Drosophila, nuclei surrounded by pole plasm initiate the
lineage of cells that will eventually produce germ cells

e. Determination is the process by which blastomeres become
committed to certain fates.

2.Which of the following characteristics is not unique to
cleavage in eutherian mammals? Select one:

a. Blastomeres divide asynchronously

b. Early cell divisions produce a loosely associated ball of
cells

c. Proceeds relatively slowly

d. Rotational pattern

e. Genes expressed during cleavage play roles in cleavage

3.Whereas _______ contributes to the _______, _______
contributes to the _______. Select one:

a. endoderm; nervous system; mesoderm; bones and muscles

b. ectoderm; teeth; endoderm; dermal layer of the skin

c. endoderm; lining of the respiratory tract; ectoderm;
heart

d. ectoderm; nervous system; mesoderm; bones and muscles

e. endoderm; lining of digestive tract; mesoderm; epidermis

4.Which of the following about frog eggs and early development
is false? Select one:

a. The haploid nucleus of the egg is located in the animal
hemisphere and yolk is concentrated in the vegetal hemisphere.

b. The site of sperm entry will become the ventral region of the
embryo.

c. Sperm binding sites occur only on the surface of the animal
hemisphere.

d. The gray crescent will become the dorsal region of the
embryo.

e. Distribution of the transcription factor b-catenin becomes
concentrated in the animal hemisphere following rotation of the
cortical cytoplasm.

5.If you were designing an embryology lab and wanted to expose
your students to as many different patterns of cleavage as
possible, which of the following combinations of animals would be
the most appropriate to include? Select one:

a. Snail; bird; lizard; fruit fly; eutherian mammal

b. Frog; snail; bird; fish; fruit fly

c. Frog; snail; bird; fruit fly; eutherian mammal

d. Frog; bird; fish; fruit fly; eutherian mammal

e. Frog; fish; lizard; snail; fruit fly