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

Sex Chromosome

Genetics

3. Extensions to Mendelian Inheritance

Sex Chromosome

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Multiple Choice

Which of the following is true of a species that has a chromosome number of 2n=16?

It has 32 chromosomes in total, half of which are sex chromosomes.

It has 8 chromosomes in total, with no sex chromosomes.

It has 8 pairs of chromosomes, including sex chromosomes if present.

It has 16 pairs of chromosomes, all of which are autosomes.

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Verified step by step guidance

Understand the meaning of the notation 2n=16: Here, '2n' represents the diploid number of chromosomes, which is the total number of chromosomes in a somatic cell of the species.

Since 2n=16, this means the species has 16 chromosomes in total in its diploid cells.

Determine the number of chromosome pairs by dividing the total chromosome number by 2, because chromosomes come in homologous pairs in diploid organisms. So, the number of pairs is $\frac{16}{2} = 8$ pairs.

Recognize that these 8 pairs include all chromosomes, which may consist of autosomes and sex chromosomes if the species has them. The problem does not specify the presence or absence of sex chromosomes, so the pairs include sex chromosomes if present.

Evaluate each statement based on these facts: The species does not have 32 chromosomes (so the first statement is false), it does not have 8 chromosomes total (second statement is false), it has 8 pairs including sex chromosomes if present (third statement is true), and it does not have 16 pairs (fourth statement is false).