Transcript Heredity Test Review

Heredity Test Review
Punnet Square: Chart used to predict the
_______________ of two parents
T
T
t
T
TT
Tt
Use the completed Punnet Square
to answer the questions
T
T
t
T
TT
TT
Tt
Tt
If T is the dominant allele for
a straight tail in rats and t
is the recessive allele for a
curly tail:
What is the probability of the
rat offspring having a curly
tail?
What is the probability the
offspring will be carriers of
a curly tail trait?
If you cross a rabbit that is heterozygous for floppy
ears with a rabbit that is homozygous for short
ears, (floppy ears F are a dominant trait)
What are the possible
phenotypes of the
offspring?
What is the ratio of
floppy ears to short
ears in the offspring?
The Punnet square will look like this
F
f
f
Ff
ff
f
Ff
ff
What are the possible
phenotypes of the
offspring?
What is the ratio of
floppy ears to short
ears in the offspring?
Now let’s think backwards!
?
?
?
PP
PP
?
Pp
Pp
What would the
genotypes of the
parents be if you
know the genotypes
of the possible
offspring?
Ratio or Probability?
The mathematical
chance something
will happen
Written as a fraction
or a percent
ex. ½ or 50 %
A comparison of two
numbers
Written as a fraction
or with a colon
between
ex. 3/1 or 3:1
Heterozygous or Homozygous?
A genotype that has
two of the same
alleles
A genotype that has
two different alleles
for a trait
ex.
ex. Bb
BB or bb
You can also say it is
________________
You can also say it is
________________
Gregor Mendel concluded
The recessive trait _________________
in the second generation.
The dominant trait occurs in a ___ to ____
ratio with the recessive trait.
Each plant had _____ set/s of
instructions for each characteristic.
Mendel chose pea plants because
• they were fast growing
• he knew a lot about them
and they were
• they were _________-pollinating