Non - Disjunction & Aneuploidy Past Year (2006 - 2015) MCQs Principles of Inheritance & Variation Botany NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

Down's syndrome in humans is due to:
1. Three 'X' chromosomes
2. Three copies of chromosome 21
3. Monosomy
4. Two 'Y' chromosomes

Subtopic: Non - Disjunction & Aneuploidy |

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In hexaploid wheat, the haploid (n) ar basic (x) numbers of chromosomes are:

1. n=7 and x=21

2. n=21 and x=21

3. n=21 and x=14

4. n=21 and x=7

Subtopic: Non - Disjunction & Aneuploidy |

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Cri-du-chat syndrome in humans is caused by the:

1.	fertilization of an XX egg by a normal y-bearing sperm
2.	loss of half of the short arm of chromosome 5
3.	loss of half of the long arm of chromosome 5
4.	trisomy of 21st chromosome

Subtopic: Non - Disjunction & Aneuploidy |

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