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

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Multiple Choice

According to Morgan, the likelihood of crossing over between two genes depends on the:

number of alleles present

type of organism

size of the genes

distance between the genes on a chromosome

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Verified step by step guidance

Understand that Morgan's work on genetic linkage and crossing over showed that the frequency of recombination between two genes is related to their physical proximity on a chromosome.

Recall that crossing over occurs during meiosis when homologous chromosomes exchange segments, and the closer two genes are, the less likely a crossover will occur between them.

Recognize that the number of alleles present does not affect the likelihood of crossing over, as crossing over is a physical event between chromosome segments, not dependent on allele variety.

Note that the type of organism or the size of the genes themselves are not the primary factors influencing crossing over frequency; rather, it is the linear distance between the genes on the chromosome.

Conclude that the correct factor determining the likelihood of crossing over between two genes is the distance between those genes on the chromosome, as Morgan demonstrated through his genetic mapping experiments.