Non-disjunction can be caused by

Multiple independent assortments

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Failure of chromosomes to separate during meiosis

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Segregation in meiosis

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Crossing over in mitosis

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Solution

The correct option is C Failure of chromosomes to separate during meiosis
Non-disjunction is the failure of homologous chromosomes or sister chromatids to separate properly during cell division. It results in daughter cells with abnormal chromosome numbers. Calvin Bridges and Thomas Hunt Morgan discovered the process of nondisjunction in dividing cells in the year 1910. This is one of the most common forms of chromosomal aberration that occurs in humans.
So, the correct option is 'Failure of chromosomes to separate during meiosis'.

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Similar questions

Q. The diagram represents the chromosomes of a person with a genetic disorder caused by non disjunction in which the chromosomes fail to separate properly. Which chromosome set display non-disjunction? What is the syndrome?

Q. The process of human spermatogenesis produces four sperm cells. Of the four cells produced, two of them have 20 chromosomes, and two of them have 26 chromosomes. The non-disjunction that caused the cells to have an unbalanced chromosome number probably occurred during which stage of meiosis?

Q. The non-disjunction, in meiosis may result is extra copy of a chromosome in a sperm cell. During which phase the above phenomenon may occur?

Q. In which stage the chromosomes combine and begin to separate from each other during meiosis cell division?

Question 4
During Anaphase - I of meiosis
(a) homologous chromosomes separate
(b) non-homologous autosomes separate
(c) sister chromatids separate
(d) non-sister chromatids separate

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