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1. Introduction to Genetics51m
2. Mendel's Laws of Inheritance3h 37m
3. Extensions to Mendelian Inheritance2h 41m
4. Genetic Mapping and Linkage2h 28m
5. Genetics of Bacteria and Viruses1h 21m
6. Chromosomal Variation1h 48m
7. DNA and Chromosome Structure56m
8. DNA Replication1h 10m
9. Mitosis and Meiosis1h 34m
10. Transcription1h 0m
11. Translation58m
12. Gene Regulation in Prokaryotes1h 19m
13. Gene Regulation in Eukaryotes44m
14. Genetic Control of Development44m
15. Genomes and Genomics1h 50m
16. Transposable Elements47m
17. Mutation, Repair, and Recombination1h 6m
18. Molecular Genetic Tools19m
- Genetic Cloning
  9m
- Methods for Analyzing DNA
  9m
19. Cancer Genetics29m
- Overview of Cancer
  21m
- Cancer Mutations
  7m
20. Quantitative Genetics1h 26m
21. Population Genetics50m
- Hardy Weinberg
  19m
- Allelic Frequency Changes
  31m
22. Evolutionary Genetics29m

4. Genetic Mapping and Linkage

Crossing Over and Recombinants

Genetics

4. Genetic Mapping and Linkage

Crossing Over and Recombinants

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Multiple Choice

A crossover in meiosis is an exchange of genetic material between:

centromeres of homologous chromosomes

sister chromatids of the same chromosome

different chromosomes from non-homologous pairs

non-sister chromatids of homologous chromosomes

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Verified step by step guidance

Understand the structure of chromosomes during meiosis: each chromosome consists of two sister chromatids joined at the centromere.

Recall that homologous chromosomes are pairs of chromosomes, one inherited from each parent, that have the same genes but may have different alleles.

Recognize that crossover involves the exchange of genetic material, which increases genetic diversity in gametes.

Identify that crossover occurs specifically between non-sister chromatids of homologous chromosomes, meaning chromatids from each homologous chromosome pair but not the identical sister chromatids.

Eliminate other options: crossover does not occur between centromeres, sister chromatids (which are identical), or non-homologous chromosomes (which are different chromosome pairs).