Genes are the basic unit of inheritance by which characteristics are passed on from one generation to another
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Genes are the basic unit of inheritance by which characteristics are passed on from one generation to another.
DNA-Deoxyribonucleic acid, contains instructions in the form of 4 chemicals which act as code letters.
DNA forms double helix and has 4 bases- Adenine (A), guanine(G), cytosine(C), thymine(T).
They form pairs
, A and T; G and C.
Chromosomes – long strands of DNA.
In each cell
, the nucleus has 46
, 23 from mother and 23 from father.
- Physical characteristics that are passed down / inherited
from one generation to next
, genes code for specific traits.
- Different versions of the same gene.
-One version of the pair of genes that appear at a particular location on a particular chromosome and control the same characteristics like eye color.
have two alleles for a trait
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Human head and neck