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

2. Mendel's Laws of Inheritance

Sex-Linked Genes

Genetics

2. Mendel's Laws of Inheritance

Sex-Linked Genes

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Multiple Choice

Which types of inheritance are observed in the ABO blood group system of humans?

Mitochondrial inheritance

Sex-linked inheritance

Codominance and multiple alleles

Incomplete dominance only

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Verified step by step guidance

Step 1: Understand the ABO blood group system involves three main alleles: \( I^A \), \( I^B \), and \( i \). These alleles determine the blood type of an individual.

Step 2: Recognize that the alleles \( I^A \) and \( I^B \) are codominant, meaning that if both are present, both traits are expressed equally, resulting in blood type AB.

Step 3: Note that the allele \( i \) is recessive to both \( I^A \) and \( I^B \), so it only expresses blood type O when two copies are present (homozygous recessive).

Step 4: Understand that the presence of more than two alleles (\( I^A \), \( I^B \), and \( i \)) in the population is an example of multiple alleles inheritance.

Step 5: Conclude that the ABO blood group system demonstrates both codominance (between \( I^A \) and \( I^B \)) and multiple alleles (three alleles in the population), rather than mitochondrial or sex-linked inheritance.