The end product of cleavage is a __________.
- a. gamete
- b. blastula
- c. gastrula
- d. zygote
Concept Introduction: Cleavage is a process of repeated mitotic divisions where the enormous amount of cytoplasm is distributed to form several small cells. Cleavage is a part of development.
Answer to Problem 1SQ
Correct answer: The end product of cleavage is a blastula. Therefore, option b. is correct.
Explanation of Solution
Reasons for the correct statement:
The sperm and egg unite to form the zygote. The zygote then undergoes several mitotic divisions repeatedly. These repeated mitotic divisions are collectively called as cleavage. At the end of cleavage the blastula is formed. The blastula has a covering called as blastoderm and the cavity inside called as blastocoel. The blastula is made of cells called as blastomeres. The size of the blastula varies from species to species.
Option b. is given as “blastula”
As blastula is formed at the end of all cleavage divisions, option b. is correct.
Reasons for the incorrect statements:
Option a. is given as “gamete”. The gamete is produced at the end of gametogenesis not cleavage. Therefore, option a. is incorrect.
Option c. is given as “gastrula”. At the end of cleavage, the blastula is formed first and then the gastrula is formed.
Therefore, option c. is incorrect.
Option d. is given as “zygote”. The zygote undergoes cleavage to form the blastula.
Therefore, option d. is incorrect.
Hence, options a., c., and d. are incorrect.
The end product of cleavage is a blastula. The cleavage is of various patterns based on which the development of the animal is determined.
Want to see more full solutions like this?
Chapter 42 Solutions
Biology: Unity and Div. of Life (Looseleaf)
Additional Science Textbook Solutions
Brock Biology of Microorganisms (14th Edition)
Human Biology: Concepts and Current Issues (8th Edition)
Biology: Life on Earth (11th Edition)
Microbiology: An Introduction (13th Edition)
Marine Biology (Botany, Zoology, Ecology and Evolution)
Laboratory Experiments in Microbiology (12th Edition) (What's New in Microbiology)
- Gametogenesis requires the conclusion of meiosis II. When does this occur in females? a. During fetal development b. At the onset of puberty c. After fertilization d. After implantationarrow_forwardA human blastocyst normally implants in ................. a. an oviduct c. the uterus b. a seminiferous tubule d. the vaginaarrow_forwardThe process of gastrulation forms the _______. a. blastula b. zygote c. organs d. germ layersarrow_forward
- In human beings, after fertilisation, the structure which gets embedded in the wall of uterus is: (a) ovum (b) embryo (c) foetus (d) zygotearrow_forwardIn humans, the development of fertilised egg takes place in the: (a) ovary (b) testis (c) oviduct (d) uterusarrow_forwardAfter fertilisation, the resulting cell which gives rise to a new individual is the: (a) embryo (b) ovum (c) foetus (d) zygotearrow_forward
- Egg and sperm cells are... A. Gametes B. Diploid C. Somatic cells D. Zygotesarrow_forwardA change in the amount of yolk and its distribution in the egg will affect: A Fertilization B Formation of zygote C Pattern of cleavage D Number of blastomeres producedarrow_forwardThe main function of the acrosome reaction is to (a) activate the egg (b) improve sperm motility (c) prevent interspecific fertilization (d) facilitate penetration of the egg coverings by the sperm (e) cause fusion of the sperm and egg pronucleiarrow_forward
- Regarding oogenesis, diplotene stage begins at a.birth b.Meiosis II c.7th month of fetal development. d.pubertyarrow_forwardIf an egg cell were treated with EDTA, a chemical that bindscalcium and magnesium ions,(A) the acrosomal reaction would be blocked.(B) the fusion of sperm and egg nuclei would be blocked.(C) the fast block to polyspermy would not occur.(D) the fertilization envelope would not form.arrow_forwardInternal and external fertilization differ in that species thata. produce an amniotic egg have internal fertilization.b. without an amniotic egg have external fertilization.c. produce live young have mammary glands.d. lay eggs are external fertilizersarrow_forward
- Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage LearningConcepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College