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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

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

In a sex-linked pedigree, if females are labeled as 'XX', how should males be labeled?

XXY

XYY

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Verified step by step guidance

Understand that in humans, sex determination is based on the combination of sex chromosomes: females have two X chromosomes (XX), and males have one X and one Y chromosome (XY).

Recognize that the question is about labeling males in a sex-linked pedigree, where females are labeled as 'XX'.

Recall that males cannot be 'YY' because the Y chromosome alone does not carry all the necessary genes for viability; males must have one X chromosome.

Note that 'XXY' represents a chromosomal abnormality (Klinefelter syndrome), not the typical male genotype.

Conclude that the correct label for males in a sex-linked pedigree is 'XY', representing one X and one Y chromosome.