Approximately how many human single-gene traits and illnesses are currently known from medical reports?
Correct answer: C. 10000
- A. 100
- B. 1000
- C. 10000
- D. 100000
Explanation
Single gene disorders are caused by defects in one particular gene. There are over 10,000 human disorders caused by a change, known as a mutation, in a single gene. Individually, single gene disorders are each very rare, but as a whole, they affect about one per cent of the population.
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About Inheritance
Mendel's laws explain segregation, independent assortment and the prediction of genetic ratios using alleles, genotypes and phenotypes. The chapter also covers linked genes, recombination and crossing over during meiosis, then applies pedigree reasoning to X-linked recessive traits, which show different inheritance patterns in males and females.
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Which of the following incorrectly identifies the mode of inheritance for the given genetic disease?
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