Here the relation between genotype and phenotype is illustrated, using a Punnett square, for the character of petal colour in a pea plant. The letters B and b represent alleles for colour and the pictures show the resultant flowers. The punnet square shows the cross between two heterozygous parents where B represents the dominant allele for purple and b represents the recessive allele for white . A genotype is an organism 's complete set of genetic material. Often though, genotype is used to refer to a single gene or set of genes, such as the genotype for eye color. The genes take part in determining the characteristics that are observable (phenotype) in an organism  , such as hair color, height, etc. An example of a characteristic determined by a genotype is the petal color in a pea plant. The collection of all genetic possibilities for a single trait are called alleles; two alleles for petal color are purple and white.
Here the relation between genotype and phenotype is illustrated, using a Punnett square, for the character of petal colour in a pea plant. The letters B and b represent alleles for colour and the pictures show the resultant flowers. The diagram shows the cross between two heterozygous parents where B represents the dominant allele (purple) and b represents the recessive allele (white) . The genotype of an organism is its complete set of genetic material. However, the term is often used to refer to a single gene or set of genes, such as the genotype for eye color. The genes take part in determining the characteristics that are observable in an organism (its phenotype) , such as hair color, height, etc. An example of a characteristic determined by a genotype is the petal color in a pea plant. The collection of all genetic possibilities for a single trait are called alleles; two alleles for petal color are purple and white.
R
punnet square
diagram
R
for purple
(purple)
R
for white
(white)
R
A genotype is an organism 's
The genotype of an organism is its
R
Often though, genotype is
However, the term is often
D
(phenotype)
A
(its phenotype)