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Punnett Squares

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If you wanted to know the type of offspring a cross between two parents would ... Squares are filled by writing the letter at the top beside the letter on the side. ... – PowerPoint PPT presentation

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Title: Punnett Squares


1
Punnett Squares
2
Punnett Squares
A Model used to show the possible ways genes
can combine during fertilization.
3
Punnett Squares
Punnett Squares
Helps you keep track of traits.
4
.
Punnett Squares
Dominant and recessive alleles are represented by
letters.
5
Punnett Squares
A capital letter (T) is used for dominant alleles.
T
6
Punnett Squares
A lowercase letter (t) is used for recessive
alleles.
t
7
Punnett Squares
If you wanted to know the type of offspring a
cross between two parents would produce, you can
use a punnett square.
Tt x Tt TT,Tt for tall Tt for short
8
Punnett Squares
The letters representing the alleles from one
parent are placed along the top of the square.
T t
9
Punnett Squares
The letters representing the two alleles from the
second Parent are places along the side of the
square.
T t
10
Punnett Squares
T t x T t
T t
T t
11
Punnett Squares
Squares are filled by writing the letter at the
top beside the letter on the side.
T t
T t
12
Punnett Squares
The letters in each of the squares represents the
Genotypes of the offspring that the parents could
produce.
  • TT
  • Tt
  • Tt
  • t t

T t
T t
13
Punnett Squares
The genotype (genetic makeup) can be used to
predict the phenotype (physical appearance) of
the offspring.
14
Punnett Sqaures
Genotype Phenotype
  • TT tall
  • Tt tall
  • Tt tall
  • t t short

15
Punnett Squares
Probability the ratio that a particular event
could occur.
31
3 would be tall 1 would be short
out of 4 offspring
16
Punnett Squares
  • Help you keep track of traits.
  • Predict genotype and phenotype.
  • Calculate probability.
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