It is a powerpoint presentation that discusses about the lesson or topic: Punnett Square. It also talks about the definition, history and the process that are included in the field of Punnett Square.
2. Punnett Square
It is a diagram that is used to
predict an outcome of a
particular cross or breeding
experiment
Named after Reginald C.
Punnett
3. Punnett Square
It is used by biologists to
determine the probability of an
offspring having a
particular genotype.
These tables can be used to
examine the genotypic outcome
probabilities of the offspring of a
single trait (allele), or when
crossing multiple traits from the
4. Punnett Square
Vocabulary
Dominant Genes – Upper Case
(A)
Recessive Genes – Lower Case
(a)
Each parent has two genes for
a trait (Aa), (aa), or (AA)
There can be four possible
combinations for each cross
5. Punnett Square
Vocabulary
Genotype – The gene combination
Homozygous – Pure dominance or pure
recessive
Heterozygous – Hybrid mixed
Phenotype – The physical appearance
Dominant trait
Recessive trait
Combination of two traits (Incomplete
dominance)
6. Monohybrid Cross
Crossing with only one trait
It is a cross between 2 parents
possessing a pair of contrasting
characters is also known as
monohybrid cross
7. Punnett Square
Process:
1. Determine alleles of
each parent, these
are given as TT,
and tt respectively.
2. Take each
possible allele of
each parent,
separate them, and
place each allele
either along the top,
or along the side of
8. Punnett Square
Process:
Lastly, write the letter
for each allele
across each column
or down each row.
The resultant mix is
the genotype for the
offspring. In this
case, each offspring
has a Tt
(heterozygous tall)
genotype, and
simply a "Tall"
9. Dihybrid Cross
It is a cross between two different
independent alleles
The process in doing the Punnett
Square is very similar to the
Monohybrid Cross