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Title: Punnett Squares
Description: Learn how to make a basic punnet square, cross between one trait.
Description: Learn how to make a basic punnet square, cross between one trait.
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TODAY’S SPI & OBJECTIVES
IWBAT convert fractions to percentages
and vice versa
IWBAT predict genotypic and phenotypic
ratios of offspring of a monohybrid cross
using Punnett squares
WHERE DID
IT ALL
BEGIN??
GENETICS & HEREDITY
GREGOR MENDEL
Gregor Mendel, an
Austrian scientist in
the late 1800s, is
considered the “father
of genetics”
MENDEL AND GENETICS
Mendel studied various
traits in pea plants
• Color, texture, etc
...
The Punnett square is a tool that uses
the parental genotypes for specific traits
to predict the probability of specific
genotypes and phenotypes in their
offspring
PROBABILITY
2
...
• 0/4= 0%
• 1/4= 25%
• 1/2= 50%
• 2/4= 50%
• 3/4= 75%
• 4/4= 100%
PUNNETT SQUARES
On the next few slides, we will create Punnett
squares for the two key crosses done by
Mendel using pea plants
In pea plants, the allele for yellow seed
color (Y) is dominant, and the allele for
green seed color (y) is recessive
...
Parent (P): A homozygous
dominant (YY) male plant is
crossed with a homozygous
recessive (yy) female plant
...
Two heterozygous
guinea pigs are mated
...
A
homozygous recessive tiger is
crossed with a tiger
heterozygous for coat color
...
1
...
If a heterozygous mouse and homozygous
recessive mouse mate, what percentage of
offspring would be expected to have short
tails?
DISCOVERY HD
http://www
...
com/watch?v=0vAAf4g5iF8
Title: Punnett Squares
Description: Learn how to make a basic punnet square, cross between one trait.
Description: Learn how to make a basic punnet square, cross between one trait.