Table of contents

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

Previous problemNext problem

Struggling with Genetics?

Join thousands of students who trust us to help them ace their exams!Watch the first video

Multiple Choice

Which of the following statements best explains why sister chromatids are no longer identical to each other after crossing over during meiosis?

Crossing over causes mutations in the DNA sequence of sister chromatids.

Crossing over exchanges genetic material between non-sister chromatids of homologous chromosomes, resulting in new combinations of alleles.

Sister chromatids separate during crossing over, leading to loss of genetic material.

Crossing over only affects the centromere region, leaving the chromatids otherwise identical.

Previous problemNext problem

Verified step by step guidance

Understand that sister chromatids are originally identical copies of a single chromosome formed during DNA replication.

Recognize that crossing over occurs during prophase I of meiosis between homologous chromosomes, not between sister chromatids.

Know that crossing over involves the exchange of genetic material between non-sister chromatids of homologous chromosomes, which creates new allele combinations.

Realize that because crossing over happens between non-sister chromatids, sister chromatids end up with different genetic information after this process.

Conclude that the reason sister chromatids are no longer identical after crossing over is due to this exchange of genetic material between homologous chromosomes, not because of mutations or separation of sister chromatids.