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Biology
Principles of Inheritance and Variation
198 questions from 38 papers, each with its answer.
- 198 questions
- 38 papers
- 5.62% of Biology
Sex-linked inheritance
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Represented below is the inheritance pattern of a certain type of traits in humans. Which one of the following conditions could be an example of this pattern?
The diagram shows the trait passing from the mother to the son and from the father to the daughter, i.e., a criss-cross pattern of inheritance.
Such a pattern is characteristic of genes located on the X chromosome: a son receives his only X chromosome from his mother, while a father passes his X chromosome only to his daughters.
Haemophilia is a sex-linked (X-linked) recessive disorder and follows this pattern.
Thalassemia, phenylketonuria and sickle cell anaemia are autosomal recessive disorders; they are inherited equally by sons and daughters from both parents and do not show criss-cross inheritance.
Hence the condition that could be an example of this pattern is haemophilia.
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