Question

Numerical change in chromosome number which is not the exact multiple of haploid genome is?

• A. Triploid
• B. Allopolyploid
• C. Autopolyploid
• D. Aneuploid

Answer 1

Answer: (D)

Aneuploid

1) Triploidy is a rare chromosomal abnormality in which fetuses are born with an extra set of chromosomes in their cells. One set of chromosomes has 23 chromosomes. This is called a haploid set. Two sets, or 46 chromosomes, are called a diploid set. Three sets, or 69 chromosomes, are called a triploid set.

2) Allopolyploid. : an individual or strain whose chromosomes are composed of more than two genomes each of which has been derived more or less complete but possibly modified from one of two or more species.

3) Autopolyploidy is when chromosomes come from the same species. Autopolyploidy occurs when an individual has more than two sets of chromosomes (4n), all derived from an original species (2n).Example is Homosapiens, we are a single species and the offsprings which are produced contain chromosomes from the same species.

4) Aneuploidy is the presence of an abnormal number of chromosomes in a cell, for example a human cell having 45 or 47 chromosomes instead of the usual 46. It does not include a difference of one or more complete sets of chromosomes.

So, the correct answer is 'Aneuploid'.