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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

If two crossovers occur between two loci during meiosis, which of the following best describes the genetic composition of the resulting gametes?

No gametes will contain genetic material from both parents

Gametes will be a mix of parental and recombinant types, but double crossovers restore the parental configuration

All gametes will be recombinant types

All gametes will be parental types

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Verified step by step guidance

Understand that during meiosis, crossing over between two loci can produce recombinant chromosomes, which have a mix of genetic material from both parents.

Recognize that a single crossover between two loci results in two recombinant and two parental chromatids, leading to a mix of gametes.

Consider that when two crossovers occur between the same two loci, the second crossover can reverse the effect of the first crossover on the chromatids involved.

Recall that double crossovers between two loci restore the original arrangement of alleles, meaning the chromatids end up with parental combinations rather than recombinant ones.

Conclude that the gametes produced after two crossovers will mostly resemble parental types, as the double crossover effectively cancels out the recombination effect.