In insects like fruit flies, the first cleavages do not do cytokinesis, forming loose nuclei which migrate to the edge where they obtain separate cell membranes. Why do fly embryos develop like this? A. The egg could not store enough nutrients to fuel all the stages of mitois B. The nuclei compete and only the strong ones get to be the fly’s front end C. It is how they deal with having lots of yolk which can be a challenge for cytokinesis. D. The center of fly eggs contains anti-parasite chemicals that dissolve cell membranes. 6

In insects like fruit flies, the first cleavages do not do cytokinesis, forming loose nuclei which migrate to the edge where they obtain separate cell membranes. Why do fly embryos develop like this? A. The egg could not store enough nutrients to fuel all the stages of mitois B. The nuclei compete and only the strong ones get to be the fly’s front end C. It is how they deal with having lots of yolk which can be a challenge for cytokinesis. D. The center of fly eggs contains anti-parasite chemicals that dissolve cell membranes. 6

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter7: The Cellular Basis Of Inheritance

Section: Chapter Questions

Problem 3RQ: Which type of life cycle has both a haploid and diploid multicellular stage? a. an asexual life...

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One day while walking across campus, you see a female butterfly laying fertilized eggs, as shown in the image below: 1. When the female butterfly’s eggs are fertilized, the fusion (2N) nucleus will divide repeatedly giving rise to cleavage nuclei, which: a. can become trophocytes that migrate into the germarium and connect to the developing embryo by nutritive cords. b. can migrate to the periplasm and become cleavage cells that ultimately give rise to the germ band and the serosa. c. can migrate to the peripheral cytoplasm and become germ cells, which eventually move into the forming gonads and become oogonia or spermatogonia. d. can remain in the yolk and become vitellophages that digest the yolk and make nutrients available to the forming embryo. e. only b and c f. only a and d g. all except a h. all except d 2. In the mature, unfertilized egg of the adult female butterfly: a. bicoid mRNAs will congregate at the end of the…
In insect embryonic development, the fertilized egg nucleus divides repeatedly giving rise to multiple nuclei that migrate to the periplasm (peripheral cytoplasm) and become cells called ____ or remain in the yolk and become cells called ____ that digest the yolk. A region of the cells that form in the periplasm thickens and become the____ , which develops into the embryo.
Sea urchins exhibit a holoblastic cleavage pattern. What factor contribute to this cleavage pattern? a. The amount/distribution of yolk b. Conditional specification of the vegetal layer by large micromeres c. The angle of the mitotic spindle and its time of formation d. Maternal factors
In organisms such as the chick, in which the egg has extensive yolk, the eggA. shows complete cleavage.B. shows incomplete cleavage.C. forms a blastoderm but no blastocoel.D. shows even distribution of the yolk.E. fails to synthesize DNA during cleavage.
Which of these are cellular activities that sustain a single-celled organism through its lifetime? Select all that apply. A. Increases in cell size and volumeB. Processes by which individuals produce offspringC. The transmission of DNA to offspringD. Development into a multi-celled adult
Which mechanism prevents an ovum from being fertilized by multiple sperm cells? A. Once a sperm penetrates the jelly-like coating of the egg, no other sperm cell can penetrate the coating. B. When a sperm fuses with the plasma membrane of the egg, depolarization of the membrane occurs. C. The egg can survive in the Fallopian tube for 24 hours s it does not have mitochondria to produce energy. D. When more than a single sperm cell fuses with the plasma membrane, multiple zygotes can form, leading to the twin or triplets.
Why is it easier to manipulate embryonic stem cells to differentiate into various tissues than it is to manipulate a typical adult cell? a. As cells develop, signaling pathways can cause some genes to be turned off during development. b. Adult cells have different DNA content than do embryonic stem cells. c. Emybronic stem cells pose less of a threat for organ rejection as do an individual s own adult cells. d. It is no easier to manipulate emybronic stem cells to differentiate into various tissues than it is to manipulate a typical adult cell.
A. In order to create an embryo from a somatic cell, the donor egg cell must have its ________________________ removed. B. Why is cloning extinct animals problematic?
A small amount of cytoplasm will leak out of a fertilized Drosophila egg if it is punctured at the anterior end. Predict how this is likely to affect the development of the fly embryo. Give a detailed explanation for your prediction.
Which of the following is true about Cleavage? Choose all possible answers a. At the end of cleavage, a 32-cell zygote called morula is formed. b. The angle and timing of mitotic spindle influence the pattern of embryonic cleavage. c. Cleavage is a series of mitosis that happens after the formation of zygote. d. The yolk protein is essential in determining where cleavage can occur
Why is the frog pattern of cleavage different from the sea urchin pattern of cleavage? Group of answer choices A. the frog cells all divide at the same rate and are all the same size B. the frog vegetal pole cells divide more slowly and are large and yolk-filled C. the frog vegetal pole cells divide more slowly and are small D. the yolk does not divide in the frog E. the blastopore forms the mouth
Which of the following is not true about frogs eggs and blastula formation? Choose all possible answers a. denser yolk in the animal hemisphere. b. Cleavage is holoblastic c. first cleavage plane is meridional and bisects the gray crescent, revealing the existence of some factor(s) that determine(s) the initial orientation of the cleavage spindle. d. first furrow also marks the plane of bilateral symmetry in the body e. All four blastomeres differ in sizes. f. All of the following are true about eggs of frogs.