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Genes
The three main parts of a cell are the cell membrane,
the cytoplasm, and the nucleus
...
In humans there are 23 pairs
of chromosomes found in the nucleus of all cells,
except sex cells
...
Each chromosome structure is made
from a long coiled up molecule, of a
substance called DNA
...
and a gene is a
shorå seciion of this DNA
...
Each gene contains a set of
coded instructions for a particular characteristic
...
g
...
Variations caused by genes are called inherited variation because we inherit our genes through
our parents
...
g
...
g
...
Differel?t
forms of the same gene are called alleles
...
So, you might have two
the same or two different alleles
...
different alleles of the same gene
E Chromosomes contain differentgenes, which
exist as different alleles
...
To display a recessive
cteristicthe organism must have both recessive alleles cc