Archive
17th of March 2017
Biology
Q:

explain the mechanism of inheritance and how does comparing the DNA of different species help in tracing evolutionary relationships?

Sayon Ghosh - CBSE - Class X

Friday, March 17, 2017 at 17:52:PM

A:

Hi Sayon,

Mechanism of inheritance refer to the traits resulting from a single gene or multiple genes.
Gregor Mendel investigated this type of inheritance. It includes autosomal dominant inheritance, autosomal recessive inheritance and X- linked inheritance.
 
1. Autosomal dominant inheritance- Autosomal dominant inheritance refers to conditions or traits for which having a mutation on one copy of the causative gene is sufficient to develop the phenotype.
2. Autosomal recessive inheritance-utosomal recessive inheritance refers to conditions in which both copies of the gene must carry mutations to produce the phenotype.
3. X-linked inheriatnce- X-linked inheritance refers to conditions or traits that are caused by changes in genes found on the X chromosome.

While tracing evolutionary relationships by the DNA of two different organisms, protein structure is taken into consideration. So, if two organisms are closely related, they will have different protein structures.You will learn more details while studying Proteomics in Graduation level. Hope this helps you...

Friday, March 17, 2017 at 18:00:PM