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Biology 3593B Study Guide - Quiz Guide: Zona Pellucida, Ectopic Pregnancy, Trophoblast

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spectral
20 May 2020
School
Western University
Department
Biology
Course
Biology 3593B
Professor
P. McDonald

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Document Summary

Describe the interaction between sperm and oocyte. Describe how cell division and cleavage occurs in the fertilised egg during the formation of the blastocyst. Correlate this to how the egg/zygote/blastocyst moves through the oviduct. Describe changes in the organisation of the blastula following implantation. They undergo meiosis to form germ cells sperm and egg (these are haploid, with an n number of 1). The egg goes through 1st meiosis at ovulation. Entry of sperm into oocyte leads to the formation of zygote. Sperm entry causes the surface of the oocyte (zona pellucida) to become impenetrable. Then, the diploid (2n) status is attained; 1n chromosomes from the sperm and 1n chromosomes from the oocyte. There"s a solid mass of cells, each in contact with zona pellucida. Cell division is asynchronous in mammals, which means that cell can be different sizes and can divide at a different speed.

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Related Questions

  1. An organism with extensive yolk, such as the chick,

A) has incompletecleavage. D)forms a blastoderm but no blastocoel.

B) has yolk evenly distributed in the egg. E) has completecleavage.

C) fails to synthesize DNA duringcleavage.

  1. Invagination

A) occurs in sea urchins.

B) forms the archenteron in echinoderms.

C) creates unique positions for new cell interactions.

D) requires unique cell movement.

E) All of the above

  1. When the blastopore dorsal lip is grafted from one frog embryoonto a second embryo, the second dorsal lip will

A) change the developmental fate of the surrounding cells.

B) change the polarity of the adjacent segments.

C) cause rapid cell division.

D) block gastrulation.

E) change the prospective potency of the surrounding cells.

  1. Gastrulation in birds differs in many ways from gastrulation infrogs. The main feature that both have in common is that

A) the neural tube forms.

B) somites are created.

C) cells from the surface of the blastocyst migrate to form thegut.

D) three germ layers are established.

E) All of the above

  1. In humans, the secondary oocyte forms:
  1. at ovulation.
  2. during telophase I.
  3. after fertilization.
  4. at birth.
  5. all of the above.

  1. In Ascaris:
  1. The secondary oocyte is fertilized.
  2. Two polar bodies are visible when the secondary oocyte is inprophase II.
  3. Both a haploid and a diploid nucleus are present in a primaryoocyte during early prophase I.
  4. Cell plates are formed during both anaphase I and anaphaseII.
  5. No correct answer is given.
  1. A gastrula is:

a. an embryo that is younger than a blastula.

b. a stage in development that has three tissue layers.

c. a type of egg that has yolk concentrated at one end of thecell.

d. an opening in the center of an early embryo.

e. something else

  1. A human cell containing 22 autosomes and one Y chromosome isa

a. somatic cell of amale b. zygote

c. somatic cell of afemale d. a sperm e. an ovum

  1. The spermatogonium is ________ , and the primary spermatocyteis __________ .

a. diploid,haploid b. haploid, diploid

c. haploid,haploid d. diploid,diploid e. triploid, diploid

  1. The first cavity formed in the rapidly dividing starfish embryois the:

a. Blastoderm. b. Archenteron.

c. Neural groove. d. Blastocoel. e. Trophoblast.