Biology 2e
2nd Edition
ISBN: 9781947172517
Author: Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher: OpenStax
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Chapter 13, Problem 10RQ
Assume a pericentric inversion occurred in one of two homologs prior to meiosis. The other homolog remains normal. During meiosis, what structure—it any—would these homologs assume in order to pair accurately along their lengths?
- V formation
- cruciform
- loop
- pairing would not be possible
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Assume a pericentric inversion occurred in one of two homologs prior to meiosis. The other homolog remains normal. During meiosis, what structure—if any—would these homologs assume in order to pair accurately along their lengths? a. V formation b. cruciform c. loop d. pairing would not be possible
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Chapter 13 Solutions
Biology 2e
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- The majority of nondisjunction events leading to Down syndrome are maternal in origin. Based on the duration of meiosis in females, speculate on the possible reasons for females contributing aneuploid gametes more frequently than males do.arrow_forwardFigure 13.6 Which of the following statements about nondisjunction is true? Nondisjunction only results in gametes with n+1 or n-1 chromosomes. Nondisjunction occurring during meiosis II results in 50 percent normal gametes. Nondisjunction during meiosis I results in 50 percent normal gametes. Nondisjunction always results in four different kinds of gametes.arrow_forwardMeiosis is characterized by the pairing of homologouschromosomes during prophase I. In many species, an elaboratestructure called the synaptonemal complex forms betweenhomologues. During this pairing, homologues may exchangechromosomal material at sites called chiasmata. In meiosis I, thehomologues separate from each other, reducing the chromosomenumber to the haploid state (thus the reductive division). It isfollowed by a second division without replication, during whichsister chromatids become separated. The result of meiosis I and IIis four haploid cells. If sister chromatids separated at the first division, would meiosis still work?arrow_forward
- Assume that during meiosis I none of the C chromosomes disjoin at metaphase, but they separate into dyads (instead of monads) during meiosis II. How would this change the alignments that you constructed during the anaphase stages in meiosis I and II? Draw them.arrow_forwardIn an attempt to simplify meiosis for the benefit of stu-dents, mad scientists develop a way of preventing premei-otic S phase and making do with having just one division, including pairing, crossing over, and segregation. Would this system work, and would the products of such a sys-tem differ from those of the present system?arrow_forwardif a species of animal has 18 chromosomes in its diploid cells (2n=18). Describe what the metaphase chromosome arrangement would look like for this species in each of the following stages: mitosis, meiosis I, and meiosis Ilarrow_forward
- Sketch a comparison of Metaphase Mitosis and Metaphase I Meiosis (diploid:8 chromosomes n=4) - Be sure to number the chromosomes and use a “P” for paternal and “M” for maternal.arrow_forwardA certain species of animal has 18 chromosomes in its diploid cells (2n=18). Describe what the metaphase chromosome arrangement would look like for this species in each of the following stages: mitosis, meiosis I, and meiosis IIarrow_forwardA diploid organism produces four gametes from one parent cell through the process of meiosis. Two gametes are found to have 7 chromosomes and two gametes are found to have 5 chromosomes. A) Is this the expected number of chromosomes that would be found in each gamete following a normal cycle of meiosis? If yes, explain why. If no, explain why not and describe how the gamete situation described above occurred. B) Determine the number of homologous chromosome pairs that the original parent cell contained, before meiosis began. Explain how you determined this value.arrow_forward
- Assume that the autotriploid cell in has 3 n = 30chromosomes. For each of the gametes produced by this cell, give thechromosome number of the zygote that would result if the gamete fusedwith a normal haploid gamete.arrow_forwardIn the diagram above, Process X depicts meiosis I and Process Y depicts mitosis.One of the functions of meiosis is to produce variation in the gametes formed by this process. There are two events in meiosis that contribute to genetic variation. For EACH event that contributes to variation in meiosis: i. Name the event. ii. Name the meiotic stage it occurs in and identify that stage in the diagram above. ii. Explain how the event contributes to genetic variation.arrow_forwardA diploid (2n) trihybrid individual with the genotype EeFfGg can make eight genetically different gametes. Loci E/e and F/f are on chromosome 1 and locus G/g is on chromosome 2. Explain how a gamete containing the alleles e, f and g may be produced by meiosis. Refer specifically to meiotic events occurring during Prophase I, Metaphase I, Anaphase I and Anaphase II. (NB: remember to refer to the organism above).arrow_forward
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