Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Textbook Question
Chapter 13.3, Problem 2CC
WHAT IF? → After the synaptonemal complex disappears, how would any pair of homologous chromosomes be associated if crossing over did not occur? What effect might this have on gamete formation?
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. A mature female wolf, with 78 diploid chromosomes in each somatic cell, produces haploid oocytes (egg cells) containing how many chromosomes per cell?
1 sex-determining chromosome (Y) and 38 autosomes
2 sex-determining chromosomes (XX) and 76 autosomes
1 sex-determining chromosome (X) and 39 autosomes
2 sex-determining chromosomes (XY) and 76 autosomes
1 sex-determining chromosome (X) and 38 autosomes
Distinguishing Meiosis I from Meiosis I|
How do you know what is meiosis I and what is meiosis II?
Here are some hints to help you determine how to identify if a cell is undergoing meiosis I or meiosis II.
• In prophase l and metaphase I, the chromosomes are found in their homologous pairs. In prophase Il and metaphase ll, there are single duplicated chromosomes.
• In anaphase l and telophase I, the chromosomes are duplicated (shaped like Xs). In anaphase ll and telophase II, the chromosomes are not duplicated.
Take a look at the picture, and then answer the questions
How many chromosomes will be in the gamete produced when this cell has finished meiosis?
O 1
О 4
O 2
O 3
O 6
Thank you for the follow-up! So, in what sort of conditions would there be an extra Y chromosome? If it's not there in the first place.. how can it get transversed/moved to another chromosome? Unless it is duplicated?
Chapter 13 Solutions
Campbell Biology
Ch. 13.1 - MAKE CONNECTIONS Using what you know of gene...Ch. 13.1 - Prob. 2CCCh. 13.1 - WHATIF? A horticulturalist breeds orchids, trying...Ch. 13.2 - MAKE CONNECTIONS In Figure 13.4. how many DNA...Ch. 13.2 - VISUAL SKILLS In The karyotype shown in Figuro...Ch. 13.2 - Prob. 3CCCh. 13.2 - WHAT IF? A certain eukaryote lives as a...Ch. 13.3 - MAKE CONNECTIONS Comparc tho chromosomes in a...Ch. 13.3 - WHAT IF? After the synaptonemal complex...Ch. 13.4 - What is the original source of Variation among the...
Ch. 13.4 - The diploid number for fruit flies is 8, and the...Ch. 13.4 - Prob. 3CCCh. 13 - Explain why human offifuing resemble their parents...Ch. 13 - Prob. 13.2CRCh. 13 - Prob. 13.3CRCh. 13 - Prob. 13.4CRCh. 13 - A human cell containing 22 autosomes.and a Y...Ch. 13 - The two homologs of a pair move toward opposite...Ch. 13 - Meiosis II is similar to mitosis in that (A)...Ch. 13 - Prob. 4TYUCh. 13 - If we continue to follow the cell lineage from...Ch. 13 - DRAW IT The diagram shows a cell in meiosis. (a)...Ch. 13 - Explain how you can tell that the cell in question...Ch. 13 - EVOLUTION CONNECTION Many species can reproduce...Ch. 13 - SCIENTIFIC INQUIRY The diagram in quest ion 6...Ch. 13 - Prob. 10TYUCh. 13 - SYNTHESIZE YOUR KNOWLEDGE For selected answers,...
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- VISUALIZE Sketch a series of diagrams showing each of the following, making sure to end each series with haploid cells: (a)How a pair of alleles for a single locus segregate in meiosis (b)How the alleles of two unlinked loci assort independently in meiosis (c)How the alleles of two linked loci undergo genetic recombinationarrow_forward. Four of the following events are part of both meiosis andmitosis, but only one is meiotic. Which one? (1) Chromatidformation, (2) spindle formation, (3) chromosome condensation, (4) chromosome movement to poles, (5)synapsis.arrow_forwardA woman with normal chromosomes mates with a man who also has normal chromosomes. Q.What chromosome combinations and numbers of Barr bodies would you expect to see if the chromosomes separate normally in oogenesis, but nondisjunction of the sex chromosomes takes place in meiosis I of spermatogenesis?arrow_forward
- Discuss Concepts One of the human chromosome pairs carries a gene that influences eye color. In an individual human, one chromosome of this pair has an allele of this gene that contributes to the formation of blue eyes. The other chromosome of the pair has an allele that contributes to brown eye color (other genes also influence eye color in humans). After meiosis in the cells of this individual, what fraction of the nuclei will carry the allele that contributes to blue eyes? To brown eyes?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_forwardMeiosis DrawingIn this assignment you will track and draw the chromosomes of a diploid organism through all the stages of meiosis. Make sure you label the alleles for genes on the chromosomes the whole way through - every chromatid should have labeled alleles. For meiosis, both crossing over and independent assortment can occur. For the purpose of this exercise, assume that there is a single crossover event on the long chromosome between the A and D genes. Only show crossing over after its fully occured. There are no crossover events on the short chromosome. Regarding independent assortment, there are two possible outcomes in meiosis if there are two homologous pairs of chromsomes. Include both independent assortment possibilities - one on the left side and one on the right. Fill in the possible gamete genotypes for each outcome. If you do this correctly you should end up with 8 different types of gametes.arrow_forward
- Meiosis DrawingIn this assignment you will track and draw the chromosomes of a diploid organism through all the stages of meiosis. Make sure you label the alleles for genes on the chromosomes the whole way through - every chromatid should have labeled alleles. For meiosis, both crossing over and independent assortment can occur. For the purpose of this exercise, assume that there is a single crossover event on the long chromosome between the A and D genes. Only show crossing over after its fully occured. There are no crossover events on the short chromosome. Regarding independent assortment, there are two possible outcomes in meiosis if there are two homologous pairs of chromsomes. Include both independent assortment possibilities - one on the left side and one on the right. Fill in the possible gamete genotypes for each outcome. If you do this correctly you should end up with 8 different types of gametes. Image attached for genotypes and alleles. Give me a full explaination of each of…arrow_forwardWhat is independent assortment during meiosis 1? POSSIBLE PC if two individuals mate, and each is capable of producing over 8 million potential gametes, the random chance of any one sperm and egg coming together is a product of these two probabilities - some 70 trillion different combinations of chromosomes in a potential offspring O a process where a single cell divides twice to produce four cells containing half the original amount of genetic information O homologous pairs of chromosomes line up in random orientations at the middle of the cell as they prepare to separate O swapping of genetic material 4. 1 2 3 4. e to searcharrow_forwardIn oogenesis--> other than allowing for the elimination of one half of the diploid chromosomes, what is the purpose of the polar bodies? do they provide any resources?arrow_forward
- 10:10 E ← sisAndMeiosis.docx FREE EDIT PDF FREE CONVERT PDF TO WORD 2. Why are chromosomes important? 3. How are meiosis I and meiosis II different? 1. What is the state of DNA at the end of meiosis I? What about at the end of meiosis II? 4. Why do you use non-sister chromatids to demonstrate crossing over? 7. Identify two ways that meiosis contributes to genetic recombination. 10. P FREE PDF FILLER 5. What combination of alleles could result from a crossover between BD and bd chromosomes? 8. Why is it necessary to reduce the number of chromosomes in gametes? 6. How many nuclei are present at the end of meiosis II? How many chromosomes are in each? a. Sperm Cell b. Egg Cell AP_5 c. Daughter Cell from Mitosis ON 5G I 9. Blue whales have 44 chromosomes in every cell. Determine how many chromosomes you would expect to find in the following: d. Daughter Cell from Meiosis II COUS ra PAGE 10... FREE CONVERT JPG TO PDF X OeScience Labs, 2016arrow_forwardSelect two that apply. Which of the following generate genetic diversity in meiosis? homologous chromosomes are separated during anaphase II homologous chromosomes align individually during metaphase II O bivalents align independently from other bivalents during metaphase I sister chromatids exchange genetic material during prophase I homologous chromosomes exchange genetic material during prophase I meiosis goes through two rounds of divisionarrow_forwardDraw the stages of MEIOSIS. Start with two pairs of homologous chromosomes (this is how many PAIRS of chromosomes the somatic cell would have). Start with the END OF G2, then continue with the different stages of MEIOSIS, and then finish with the BEGINNING of G1.arrow_forward
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