Today my topic is genetics. Genetics is the branch of biology which deals with the study of genes, genetic variation and heredity is   called genetic. To know about genetic, you must know about the genes variation and heredity. To know genetic, you must know about all these so Today my topic is to tell you about genes variation and heredity
Let’s get started
Genes: to know about genes you mast know about the DNA (deoxyribonucleic acid).
So chromosome are made of proteins and DNA
DNA is composed of 5 carbon sugar phosphate group po4 and nitroguse base. Nitrogeus base are adenine thymine guanine and cytosine any part of DNA which give us functional proteins called genes.
Genetic variation: all organism is different from one another in their size shape and behaviors through change in chemical structure of chromosome. Genetic variation is brought about, fundamentally, by mutation, which is a permanent change in the chemical structure of chromosomes.
Heredity: the resemblance between parents to offspring. For example, father has big nose and mother has bushy eyebrows the son gets big nose and bushy eyebrows. The character which is transfer from parents to off spring. Another example is white cow meet red cow the son gets roan color this is called heredity.


 https://www.youtube.com/watch?v=QfxLos0rvCE&t=60s
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