Biology: The Unity and Diversity of Life
15th Edition
ISBN: 9780357093795
Author: STARR
Publisher: CENGAGE LEARNING (CUSTOM)
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Textbook Question
Chapter 12, Problem 14SQ
Match each term with the best description.
| _______ | a. basis of variation in traits | |
| _______ | metaphase I | b. useful for varied offspring |
| _______ | alleles | c. none between meiosis I meiosis II |
| _______ | prophase I | d. similar to mitosis |
| _______ | zygotes | e. haploid |
| _______ | gametes | f. form at fertilization |
| _______ | males | g. mash-up time |
| _______ | meiosis II | h. chromosome lineup |
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In experiment of following chromosomal DNA movement through meiosis, Blue have 44 chromosomes in every cell. Determibne how many chromosomes you would expect to find in the following:
a. sperm cell
b. egg cell:
c. Daughter Cell from mitosis:
d. Daughter cell from Meiosis ll:
A cell has n=2. How many total chromosomes are in a diploid cell?
b. Draw this cell during metaphase of mitosis:
The diploid number of chromosomesa. is the 2n number.b. is in a parent cell and therefore in the two daughter cellsfollowing mitosis.c. varies according to the particular organism.d. is present in most somatic cells.e. All of these are correct.
Chapter 12 Solutions
Biology: The Unity and Diversity of Life
Ch. 12 - BPA and Abnormal Meiosis In 1998, researchers at...Ch. 12 - BPA and Abnormal Meiosis In 1998, researchers at...Ch. 12 - BPA and Abnormal Meiosis In 1998, researchers at...Ch. 12 - One evolutionary advantage of sexual over asexual...Ch. 12 - Prob. 2SQCh. 12 - Prob. 3SQCh. 12 - Prob. 4SQCh. 12 - Meiosis ______ the parental chromosome number. a....Ch. 12 - Dogs have a diploid chromosome number or 78. How...Ch. 12 - The cell in the diagram to the right is in...
Ch. 12 - Which of the following cells can undergo meiosis?...Ch. 12 - Prob. 9SQCh. 12 - Crossing over mixes up ______. a. chromosomes b....Ch. 12 - Crossing over happens during which phase of...Ch. 12 - Prob. 12SQCh. 12 - Which of the following is one of the very...Ch. 12 - Match each term with the best description. _______...Ch. 12 - Prob. 15SQCh. 12 - The diploid chromosome number for the body cells...Ch. 12 - In your own words, describe how genetic diversity...Ch. 12 - Make a simple sketch of meiosis in a cell with a...Ch. 12 - Asexually reproducing animal populations are rare,...Ch. 12 - Figure 12-7 shows how meiosis in a cell with three...
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- Phases of meiosis Metaphase I a) Tetrads line up on cell’s equator.arrow_forwardAfter mitosis the chromosome number of a descendant cell is ______ the parent cell's.a. the same asb. one-half ofc. rearranged compared tod. double that oarrow_forwardPairs of chromosomes with almost identical geneticcomposition and that are found in cells of both males andfemales are calleda. sex chromosomes.b. autosomes.c. polyploid.d. chromatids.arrow_forward
- Sister chromatids separate during anaphase of which of thefollowing?a. mitosis c. meiosis IIb. meiosis I d. both a and c.arrow_forwardBPA and Abnormal Meiosis In 1998, researchers at Case Western University were studying meiosis in mouse oocytes (germ cells) when they saw an unexpected and dramatic increase of abnormal events (FIGURE 12.6). Improper segregation of chromosomes during meiosis is one of the main causes or human genetic disorders. The spike in abnormal meiosis began right after the mouse facility started washing the animals' plastic cages and water bottles in a new, alkaline detergent. The detergent had damaged the plastic, which as a result was leaching bisphenol A (BPA). BPA is a synthetic chemical that mimics estrogen, the main female sex hormone in animals. Though it has since been banned for use in baby bottles, BPA is still widely used to manufacture other plastic items and epoxies (such as the coating on the inside of metal cans of food). BPA-free plastics are often manufactured with a related compound, bisphenol S (BPS), that has effects similar to BPA. FIGURE 12.6 Abnormalities in meiosis that occurred after exposure to BPA. Top, the most abnormal meiosis events occurred in mice that were housed in damaged plastic caging with damaged plastic bottles. Damaged plastic releases BPA. Bottom, fluorescent micrographs show the chromosomes (red) and spindle (green) in nuclei of mouse germ cells in metaphase I. A Normal metaphase; BD abnormal metaphase. What percentage of mouse oocytes displayed abnormalities of meiosis with no exposure to damaged caging?arrow_forwardMitosis differs from meiosis in the following ways EXCEPT:(a) Mitosis results in a full complement of chromosomesin two cells, whereas meiosis results in four cells havinghalf the number of chromosomes.(b) In mitosis, all chromosomes are replicated, whereas inmeiosis, only half are replicated.(c) Mitosis only occurs in somatic or body cells, whereasmeiosis occurs in production of gametes or sex cells.(d) None of the above.(e) a and c onlyarrow_forward
- During meiosis I, which structures separate? A. Sister chromatids B. Homologous chromosomes C. Both A and B D. Neither A nor Barrow_forwardAfter mitosis, the chromosome number of a descendant cell is_______ the parent cell’s. a. the same as c. rearranged compared to b. one-half of d. double that ofarrow_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
- 1. What process enables the body to heal after an injury? a.cell cycle b.mitosis & meiosi c.meiosisd.mitosis e.none of them 2. Checkpoints in the cell cycle control system ___________. a.stop cells from dividing b.regulate the cells by stop and go signals c.signal cells to undergo mitosis d.ensure that a cell keeps dividing 3. Which statement is TRUE about meiosis? * a.It retains the number of chromosome number. b.It reduces the chromosome number by a quarter. c.It doubles the chromosome count in gametes. d.It reduces the chromosome number by half.arrow_forwardDuring meiosis II, which structures separate? A. Sister chromatids B. Homologous chromosomes C. Both A and B D. Neither A nor Barrow_forwardAt the metaphase plate during metaphase II of meiosis, there area. chromosomes consisting of one chromatid.b. unpaired duplicated chromosomes.c. bivalents.d. homologous pairs of chromosomes.e. Both c and d are correct.arrow_forward
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