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

3. Extensions to Mendelian Inheritance

Organelle DNA

Genetics

3. Extensions to Mendelian Inheritance

Organelle DNA

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Multiple Choice

Which type of DNA is typically found in most bacterial cells?

Single-stranded RNA

Circular double-stranded DNA

Linear double-stranded DNA

Circular single-stranded DNA

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Verified step by step guidance

Understand the question is asking about the typical form of DNA found in most bacterial cells, focusing on the structure and type of their genetic material.

Recall that bacterial genomes are usually composed of DNA, not RNA, so single-stranded RNA can be excluded as a typical bacterial genetic material.

Consider the shape and strandedness of bacterial DNA: most bacteria have their DNA organized as a circular molecule rather than linear, and it is double-stranded rather than single-stranded.

Review that linear double-stranded DNA is more common in eukaryotic chromosomes, while circular double-stranded DNA is characteristic of bacterial chromosomes.

Conclude that the typical DNA found in most bacterial cells is circular double-stranded DNA, which allows for efficient replication and compact storage within the cell.

4:11m

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Textbook Question

Mothers will pass on a mitochondrial defect to their offspring. In a type of gene therapy, one approach to circumvent this problem is to have two different maternal contributions, with the nucleus of the female with the defective mitochondria being placed in an enucleated egg derived from a female with normal mitochondria. After fertilization, the resulting offspring would have three parental sources of DNA—with nuclear DNA derived from a mother and a father, and mitochondrial DNA derived from another 'mother.' Recently, children with this genetic makeup have been born, but the elimination of defective mitochondria is not complete, with the amount of defective mitochondria derived from the defective mother ranging from 0 to 9%. Discuss potential complications resulting from such a mixture of genomes.

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