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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 X-linked patterns of inheritance, which of the following is true?

Females cannot be carriers of X-linked recessive disorders.

Fathers can pass X-linked traits to their sons.

X-linked traits are inherited equally by males and females.

Males are more likely than females to express recessive X-linked traits.

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Verified step by step guidance

Understand that X-linked inheritance involves genes located on the X chromosome, which affects males and females differently due to their sex chromosome composition (XY in males, XX in females).

Recall that females have two X chromosomes, so they can be carriers of X-linked recessive disorders if only one X chromosome carries the mutation, often without showing symptoms.

Recognize that fathers pass their Y chromosome to their sons and their X chromosome to their daughters, so fathers cannot pass X-linked traits to their sons.

Note that because males have only one X chromosome, any recessive mutation on that chromosome will be expressed, whereas females would need mutations on both X chromosomes to express the trait.

Conclude that males are more likely than females to express recessive X-linked traits because they have only one X chromosome, making them hemizygous for X-linked genes.