Name: Mutations and Natural Selection
Uploaded: 2019-07-19
Duration: 3 min 18 s
Description: Our body is designed in a particular way, and DNA takes care of it. What happens if this DNA does not align in a particular way to design? Mutation occurs.

Question

Draw the diagram of different types of aneuploidy.

Accepted Answer

Aneuploidy: It is a condition in which diploid number is altered either by addition or deletion of one or more chromosomes. Organisms showing aneuploidy are known as aneuploids.

There are of two types:

1. Hyperploidy: Addition of one or more chromosomes to diploid sets are called hyperploidy. It is divided into three types.

(a) Trisomy: Addition of single chromosome to diploid set is called trisomy (2n+1). Addition of two individual chromosome from different chromosomal pairs to normal diploid sets are called Double trisomy (2n+1+1).

(b) Tetrasomy: Addition of a pair or two individual pairs of chromosomes to diploid set is called tetrasomy (2n+2).

(c) Pentasomy: Addition of three individual chromosome form different chromosomal pairs to normal diploid set are called pentasomy (2n+3).

2. Hypoploidy: Loss of one or more chromosome from the diploid set in the cell is called hypoploidy. It is divided into two types.

(a) Monosomy: Loss of single chromosome from the diploid set are called monosomy (2n-1). Loss of two individual chromosomes from the diploid set are called double monosomy (2n-1-1).

(b) Nullisomy: Loss of pair of homologous chromosomes from the diploid set are called Nullisomy (2n-2).

Draw the diagram of different types of aneuploidy.

Important Questions on Chromosomal Basis of Inheritance

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