Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 14, Problem 11SQ
Summary Introduction
Introduction: The process of cell division includes mitosis and meiosis. Mitosis is the process of cell division in which cell splits up into two genetically identical daughter cells. Meiosis is a process of cell division during sexual reproduction where chromosome number is reduced to half. Their purpose is the formation of gametes. The homologous chromosomes randomly align with their homologs at metaphase. The chromosomes are randomly paired and segregated to opposite poles during anaphase.
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In females, meiosis is not completed (a) until birth. (b) until puberty. (c) until fertilization occurs. (d) until ovulation occurs.
Why is a second polar body expelled after fertilisation? a) To remove excess cytoplasm b) Because the oocyte must reactivate the incomplete meiosis before fusing with the sperm c) Before fusion with the sperm it must complete mitosis d) The fertilised oocyte is not a haploid cell until it expels the sperms mitochondria
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 implantation
Chapter 14 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 14 - Constructing a pedigree is particularly useful...Ch. 14 - Prob. 2SQCh. 14 - Prob. 3SQCh. 14 - Prob. 4SQCh. 14 - Prob. 5SQCh. 14 - A trait that is present in a male child but not in...Ch. 14 - Color blindness is a case of ______ inheritance....Ch. 14 - A female child inherits one X chromosome from her...Ch. 14 - Prob. 1DAACh. 14 - Prob. 2DAA
Ch. 14 - Prob. 3DAACh. 14 - Prob. 9SQCh. 14 - Expression of the SRY gene on the Y chromosome...Ch. 14 - Prob. 11SQCh. 14 - Prob. 12SQCh. 14 - Prob. 13SQCh. 14 - Prob. 14SQCh. 14 - Match the chromosome terms appropriately. ____...Ch. 14 - Prob. 1GPCh. 14 - Does the phenotype indicated by the red circles...Ch. 14 - Human females have two X chromosomes (XX); males...Ch. 14 - A mutated allele responsible for Marfan syndrome...Ch. 14 - The somatic cells of most individuals with Down...Ch. 14 - Mutations in the genes for clotting factor VIII...
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- Regarding oogenesis, diplotene stage begins at a.birth b.Meiosis II c.7th month of fetal development. d.pubertyarrow_forwardDouble fertilization means that(A) flowers must be pollinated twice to yield fruits and seeds.(B) every egg must receive two sperm to produce an embryo.(C) one sperm is needed to fertilize the egg, and a second spermis needed to fertilize the polar nuclei.(D) every sperm has two nucleiarrow_forwardIn humans, sexual reproduction that produces an embryo, which then develops into a fetus, requires: a. Neither mitosis or meiosis b. Mitosis c. Both mitosis and meiosisarrow_forward
- Meiosis explains whya. you inherited half of your DNA from each of your parents.b. the sister chromatids in a chromosome are identical to each other.c. each of your somatic cells contains the same DNA.d. zygotes contain half as much DNA as somatic cells.arrow_forwardEgg and sperm cells are... A. Gametes B. Diploid C. Somatic cells D. Zygotesarrow_forwardThe..........is a hollow ball of cells that develops from the morula. a) Blastocyst b) Oviduct c) Ovary d) Chorionarrow_forward
- Meiosis is a necessary part of sexual reproduction because it_____ . a. divides two nuclei into four new nuclei b. reduces the chromosome number for gametes c. gives rise to new allelesarrow_forwardIn a possible future scenario, male fertility drops to zero, but, luckily, scientists develop a way for women to pro-duce babies by virgin birth. Meiocytes are converted di-rectly (without undergoing meiosis) into zygotes, which implant in the usual way. What would be the short- andlong-term effects in such a society?arrow_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_forward
- Which of the following statements is/are true? A. Spermatogenesis is an example of asymmetric cell division. B. The formation of a mature egg occurs through symmetric cell division. C. Spermatogenesis and oogenesis are both examples of asymmetric cell division. D. Spermatogenesis involves only symmetric cell division whereas oogenesis involves asymmetric cell division.arrow_forwardWhich cell contributes the necessary nutrition to the growing zygote? a a polar body b the egg cell c a spermatocyte d the sperm cellarrow_forwardWhich of the following stages of the fertilization process stimulates completion of meiosis II in the oocyte’s nucleus? A. The sperm nucleus and egg nucleus combine to form the genetic material of the zygote B. Sperm release enzymes to digest the protein layer of the secondary oocyte C. The entry of a sperm into the secondary oocyte D. The swimming of sperm from the vagina, through the uterus, and up to an oviductarrow_forward
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