List the different types of chromosome mutations and define...

Key Concepts

Polyploidy

Polyploidy refers to the condition where an organism has more than two complete sets of chromosomes. This numerical mutation is more common in plants and can result from errors in cell division or hybridization events, often leading to increased genetic diversity.

Deletion

A deletion is a chromosomal mutation in which a portion of the chromosome is lost or removed. This can involve the loss of one or several genes and may result in significant phenotypic effects depending on the genes involved.

Duplication

Duplication refers to a mutation where a segment of the chromosome is copied one or more times. This results in multiple copies of the genetic material in that segment, which can lead to gene dosage imbalances and potentially affect the organism’s development.

Inversion

An inversion occurs when a segment of a chromosome breaks off, flips around, and reattaches in the reverse orientation. Although all the genetic material is still present, the change in gene order can disrupt gene function and regulation.

Translocation

Translocation is a mutation that involves the exchange of chromosome segments between two non-homologous chromosomes. This rearrangement can lead to altered gene expression and may disrupt normal gene function if critical regions are involved.

Insertion

Insertion involves the addition of extra nucleotide base pairs into a chromosome. When a segment of extra DNA is introduced, it can disrupt the normal sequence and potentially interfere with regulatory sequences or gene function.

Aneuploidy

Aneuploidy is a numerical chromosomal mutation characterized by the gain or loss of individual chromosomes, leading to an abnormal number of chromosomes. Examples include conditions such as monosomy and trisomy, which arise from errors in chromosome segregation during cell division.

Transcript

0:00 Start the question.

00:01 So, in this question, they are asking us to find the types of chromosome mutation and we have to give the definition of each type of chromosome mutation.

00:13 So, the concept involved here is chromosome mutation, how it is mutated.

00:21 So, what are we going to do? so, we are going to list out each type of chromosome mutation and then we'll give.

00:30 Give its definition, each definition, okay? we'll give a basic definition so that it will make you clear.

00:42 So first, there are three types of chromosome mutation and the first type is called as, i'll write it short, chromosome rearrangement.

00:52 And the second type is called as anuploid, a new ploid, and third type is polyploid.

01:03 Polyploid.

01:04 So, first here, the structure of chromosome is altered.

01:09 Structure, okay, is altered.

01:13 And in second type, annuploidy, number of chromosome is altered.

01:20 And in the third type, full set of chromosome is added.

01:29 It is called as polyploid.

01:31 Let us look at the examples.

01:35 Okay, consider this as a chromosome.

01:38 If this is a chromosome, here in chromosome rearrangement, the chromosome may be deleted.

01:45 Okay, chromosome may be deleted shut or, or it can be inverted.

01:52 For this, i'll change the color, okay? so i'll change the color.

01:57 What happens? this part is blue and this part is black...

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