Table of contents

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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

3. Extensions to Mendelian Inheritance

X-Inactivation

Genetics

3. Extensions to Mendelian Inheritance

X-Inactivation

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Multiple Choice

In humans, what is the probability that a grandmother will pass her mitochondrial DNA to her future grandson?

100%

50%

25%

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Verified step by step guidance

Understand that mitochondrial DNA (mtDNA) is inherited exclusively through the maternal line, meaning it is passed from mother to offspring without contribution from the father.

Recognize that a grandmother passes her mtDNA to all of her children, including her daughter (the mother of the grandson in question).

Since the mother inherits her mtDNA from the grandmother, she will pass the same mtDNA to all of her children, regardless of their sex.

Therefore, the grandson receives his mitochondrial DNA from his mother, which originally came from his grandmother.

Conclude that the probability the grandmother passes her mitochondrial DNA to her grandson is 100%, because mtDNA is transmitted maternally and unchanged through generations.