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Questions and Answers
What are the two types of chromosomes classified based on their function?
What are the two types of chromosomes classified based on their function?
- Autosomes and mitochondrial chromosomes
- Dominant chromosomes and recessive chromosomes
- Autosomes and sex chromosomes (correct)
- Sex chromosomes and autosomal chromosomes
How many pairs of autosomal chromosomes do humans have?
How many pairs of autosomal chromosomes do humans have?
- 22 pairs
- 24 pairs
- 23 pairs (correct)
- 25 pairs
What is the chance of inheritance of an abnormal dominant gene from one parent?
What is the chance of inheritance of an abnormal dominant gene from one parent?
- 50% for an affected child and 50% for a non-affected child (correct)
- 100% for an affected child
- 75% for an affected child and 25% for a non-affected child
- 25% for an affected child and 75% for a non-affected child
Which type of chromosomes determine the sex of an individual?
Which type of chromosomes determine the sex of an individual?
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How many chromosomes do males have in their sex chromosomes?
How many chromosomes do males have in their sex chromosomes?
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Study Notes
Chromosomes and Inheritance
- Autosomes: non-sex chromosomes that come in pairs (1-22)
- Sex chromosomes: determine the sex of an individual, consisting of X and Y chromosomes
Autosomal and Sex Chromosomes
- Autosomal chromosomes: 23 pairs, totaling 46 chromosomes
- Sex chromosomes: one pair, consisting of X and Y
Dominant Inheritance
- A single abnormal gene from one parent is enough to cause disease
- Chance of inheritance: 50% for an affected child, 50% for a non-affected child if one parent carries the gene
X-Linked Recessive Inheritance
- Males have only one X chromosome, which is defective and can cause disease
- Chance of inheritance: dependent on the X chromosome, but specifics not provided
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