Mastering Biology with Pearson eText -- Standalone Access Card -- for Campbell Biology (10th Edition)
10th Edition
ISBN: 9780321833143
Author: Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson
Publisher: PEARSON
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Textbook Question
Chapter 29.1, Problem 3CC
WHAT IF? Ø What would the human life cycle be like if we had alternation of generations? Assume that the multicellular diploid stage would be similar in form to an adult human.
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WHAT IF? What would the human life cycle be likeif we had alternation of generations? Assume that themulticellular diploid stage would be similar in form to anadult human.
| The Role of Meiosis
Key Idea: There are two types of cell division in eukaryotes,
mitosis and meiosis, but only meiosis produces cells that are
genetically different to the parent cell.
New cells are formed when existing cells divide. There are
two forms of cell division in eukaryotes, mitosis and meiosis.
Mitosis produces two identical daughter cells from a parent
cell. Meiosis is a special type of cell division, and produces
sex cells (gametes or spores) for sexual reproduction. In
sexual reproduction, sex cells from two parents combine to
form an individual that is genetically different to its parents.
The sex cells in humans, called eggs and
sperm, are produced by meiosis. Events
occurring during meiosis creates gametes
with unique combinations of gene variants
and so creates genetic variability.
Sexual reproduction rearranges and
reshuffles the genetic material into new
combinations. This is why family members
may look similar, but they'll never be
identical (except for…
Somatic cells of chimpanzees contain 48 chromosomes.How many chromatids and chromosomes are present at: (a) anaphase of mitosis, (b) anaphase I ofmeiosis, (c) anaphase II of meiosis, (d) G1 priorto mitosis, (e) G2 prior to mitosis, (f) G1 prior tomeiosis I, and (g) prophase of meiosis I?How many chromatids or chromosomes are presentin: (h) an oogonial cell prior to S phase, (i) a spermatid, (j) a primary oocyte arrested prior to ovulation,(k) a secondary oocyte arrested prior to fertilization,(l) a second polar body, and (m) a chimpanzee sperm?
Chapter 29 Solutions
Mastering Biology with Pearson eText -- Standalone Access Card -- for Campbell Biology (10th Edition)
Ch. 29.1 - Why do researchers identify the charophytes rather...Ch. 29.1 - Identify four derived traits that distinguish...Ch. 29.1 - WHAT IF? What would the human life cycle be like...Ch. 29.1 - Prob. 4CCCh. 29.2 - Prob. 1CCCh. 29.2 - Give three examples of how structure fits function...Ch. 29.2 - MAKE CONNECTIONS Review the discussion of...Ch. 29.3 - List the key derived traits found in monilophytes...Ch. 29.3 - Prob. 2CCCh. 29.3 - Prob. 3CC
Ch. 29 - Draw a phylogenetic tree illustrating our current...Ch. 29 - Summarize the ecological importance of mosses.Ch. 29 - What trait(s) allowed vascular plants to grow...Ch. 29 - Three of the following are evidence that...Ch. 29 - Which of the following characteristics of plants...Ch. 29 - In plants, which of the following are produced by...Ch. 29 - Microphylls are found in which plant group? (A)...Ch. 29 - Suppose an efficient conducting system evolved in...Ch. 29 - Identify each of the following structures as...Ch. 29 - EVOLUTION CONNECTION DRAW IT Draw a phylogenetic...Ch. 29 - SCIENTIFIC INQUIRY INTERPRET THE DATA Ihe feather...Ch. 29 - WRITE ABOUT A THEME: INTERACTIONS Giant lycophyte...Ch. 29 - SYNTHESIZE YOUR KNOWLEDGE These stomata are from...
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- Plz asaparrow_forwardGQ6arrow_forwardMAKE CONNECTIONS Look at Figure 12.7 and imagine the twodaughter cells undergoing another round of mitosis, yielding four cells.Compare the number of chromosomes in each of those four cells, aftermitosis, with the number in each cell in Figure 13.8, after meiosis. Whatis it about the process of meiosis that accounts for this difference, eventhough meiosis also includes two cell divisions?arrow_forward
- Suppose the diagram below shows a cell during metaphase Meiosis II: microtubule a) Label the elements of the figure. b) Assuming all of the chromosomes present during Meiosis II are shown in the figure above, how many chromosomes (counting homologous pairs as two chromosomes a cell from this organism have immediately after fertilization? Tne left Showarrow_forwardCanvas What do the structures A and B represent ? A O Homologous chromosomes O Non-homologous chromosomes O Non-sister chromatids O Sister chromatids Chp 田arrow_forward..explain why meiosis occurs only in specialized cells (gametes), and that the overall goal of meiosis is to make haploid cells for sexual reproduction • ..outline the sequence of key chromosomal movements and rearrangements during the two meiotic divisions, identifying key similarities and differences between meiosis and mitosis • ..describe the ploidy of a cell before and after meiosis I and meiosis II, and how ploidy changes after separation of sister chromatids and homologous chromosomesarrow_forward
- Help please!!!arrow_forwardWhen chromatids are separated during anaphase, how do we know that the microtubules that they are connected to are not actually shortening to "pull" the chromatids apart?arrow_forwardWHAT IF? A certain eukaryote lives as a unicellularorganism, but during environmental stress, it producesgametes. The gametes fuse, and the resulting zygoteundergoes meiosis, generating new single cells. Whattype of organism could this be?arrow_forward
- Please asaparrow_forwardAnimals and plants both have diploid and haploid cells. How does the animal life cycle differ from the alternation of generations exhibited by plants?arrow_forwardwhy must sexually reproducing organisms use both processes of mitosis and meiosis, while asexually reproducing organisms only use mitosis?arrow_forward
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