This set of resources was developed and employed numerous times to help students clarify the frequent confusion about cells' chromosome number and ploidy level. It uses simplified stick diagrams to represent chromosomes and circles or oval to represent cells and includes a short, low-tech video tutorial that delivers the information, a worksheet that students can use to practice and test their understanding of the video materials, a set of clicker questions that address the same points as the worksheet, and instructor's notes.

Biology is designed for multi-semester biology courses for science majors. It is grounded on an evolutionary basis and includes exciting features that highlight careers in the biological sciences and everyday applications of the concepts at hand. To meet the needs of today’s instructors and students, some content has been strategically condensed while maintaining the overall scope and coverage of traditional texts for this course. Instructors can customize the book, adapting it to the approach that works best in their classroom. Biology also includes an innovative art program that incorporates critical thinking and clicker questions to help students understand—and apply—key concepts.

By the end of this section, you will be able to:Explain that meiosis and sexual reproduction are evolved traitsIdentify variation among offspring as a potential evolutionary advantage to sexual reproductionDescribe the three different life-cycle types among sexual multicellular organisms and their commonalities

By the end of this section, you will be able to:Explain that meiosis and sexual reproduction are evolved traitsIdentify variation among offspring as a potential evolutionary advantage to sexual reproductionDescribe the three different life-cycle types among sexual multicellular organisms and their commonalities

By the end of this section, you will be able to:Describe the behavior of chromosomes during meiosisDescribe cellular events during meiosisExplain the differences between meiosis and mitosisExplain the mechanisms within meiosis that generate genetic variation among the products of meiosis

By the end of this section, you will be able to:Describe the behavior of chromosomes during meiosisDescribe cellular events during meiosisExplain the differences between meiosis and mitosisExplain the mechanisms within meiosis that generate genetic variation among the products of meiosis

By the end of this section, you will be able to:Explain Mendel’s law of segregation and independent assortment in terms of genetics and the events of meiosisUse the forked-line method and the probability rules to calculate the probability of genotypes and phenotypes from multiple gene crossesExplain the effect of linkage and recombination on gamete genotypesExplain the phenotypic outcomes of epistatic effects between genes

By the end of this section, you will be able to:Discuss Sutton’s Chromosomal Theory of InheritanceDescribe genetic linkageExplain the process of homologous recombination, or crossing overDescribe how chromosome maps are createdCalculate the distances between three genes on a chromosome using a three-point test cross

An introduction to cellular and molecular biology. Major topics include the biochemical basis of life, cell biology, photosynthesis, respiration, mitosis, meiosis, genetics, DNA structure and replication and protein synthesis. Students engage the scientific method by designing, conducting and evaluating laboratory experiences that include selected topics in cell structure and function, enzymes, respiration, photosynthesis, genetics and molecular biology. NOTE: Students may receive credit for BIO 119 or BIO 126, but not for both.

This 27-minute video lesson looks at the phases of Meiosis. [Biology playlist: Lesson 11 of 71].

Biology is designed for multi-semester biology courses for science majors. It is grounded on an evolutionary basis and includes exciting features that highlight careers in the biological sciences and everyday applications of the concepts at hand. To meet the needs of today’s instructors and students, some content has been strategically condensed while maintaining the overall scope and coverage of traditional texts for this course. Instructors can customize the book, adapting it to the approach that works best in their classroom. Biology also includes an innovative art program that incorporates critical thinking and clicker questions to help students understand—and apply—key concepts.

This 14-minute video lesson covers the chromosomal basis for gender and sex-linked traits. [Biology playlist: Lesson 17 of 71].

Comparison of the processes of mitosis and meiosis. Mitosis produces two diploid (2n) somatic cells that are genetically identical to each other and the original parent cell, whereas meiosis produces four haploid (n) gametes that are genetically unique from each other and the original parent (germ) cell. Mitosis involves one cell division, whereas meiosis involves two cell divisions.