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

9. Mitosis and Meiosis

Mitosis

Genetics

9. Mitosis and Meiosis

Mitosis

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Multiple Choice

During the G1 stage of interphase, a diploid organism contains how many copies of each gene?

Two copies

Three copies

One copy

Four copies

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Verified step by step guidance

Understand the cell cycle phases: The G1 stage is part of interphase, which occurs before DNA replication in the S phase.

Recall that a diploid organism has two sets of chromosomes, one from each parent, so it has two copies of each gene in its genome.

During G1, the DNA has not yet been replicated, so each chromosome consists of a single chromatid, meaning each gene is present in two copies (one on each homologous chromosome).

After the S phase, DNA replication doubles the chromatids, but since the question specifies the G1 stage, replication has not occurred yet.

Therefore, the number of copies of each gene during G1 in a diploid organism is two.