Active Lecture Questions for BIOLOGY, Eighth Edition Neil Campbell & Jane Reece Questions prepared by Louise Paquin, McDaniel College Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Chapter 13 Meiosis and Sexual Life Cycles

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Overview Which of the following transmits genes from one generation of a family to another? a)DNA b)gametes c)somatic cells d)mitosis e)nucleotides

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Chromosome Number Privet shrubs and humans each have a diploid number of 46 chromosomes per cell. Why are the two species so dissimilar? a)Privet chromosomes undergo only mitosis. b)Privet chromosomes are shaped differently. c)Human chromosomes have genes grouped together differently. d)The two species have appreciably different genes. e)Privets do not have sex chromosomes.

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Karyotypes Why is it more practical to prepare karyotypes by viewing somatic diploid cells rather than haploid gametes?

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Fertilization Fertilization is to zygote as meiosis is to which of the following? a)mitosis b)diploid c)chromosome d)replication e)gamete

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Meiosis Diploid cells may undergo either mitosis or meiosis. Can haploid cells? Why or why not?

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Inquiry Shugoshin is a protein that protects cohesins from cleavage during meiosis I. What would you expect would occur if a premeiotic cell had one normal copy and one abnormal (nonfunctional) copy of the shugoshin gene? Hint: Think of one form on each member of a homologous pair.

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Independent Assortment How and at what stage do chromosomes undergo independent assortment? a)meiosis I pairing of homologues b)anaphase I separation of homologues c)meiosis II separation of homologues d)meiosis I metaphase alignment e)meiosis I telophase separation

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Disjunction What allows sister chromatids to separate in which phase of meiosis? a)release of cohesin along sister chromatid arms in anaphase I b)crossing over of chromatids in prophase I c)release of cohesion at centromeres in anaphase I d)release of cohesion at centromeres in anaphase II e)crossing over of homologues in prophase I

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Variation What are three ways in which gametes from one individual diploid cell can be different from one another?

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Rate and Process Prophase I of meiosis is generally the longest phase of meiosis. Why might this be?

Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings. Meiotic Phases In this cell, what phase is represented? a)mitotic metaphase b)meiosis I anaphase c)meiosis I metaphase d)meiosis II anaphase e)meiosis II metaphase