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Be ablq tq:
1.)
Create prinnett squares using the following dominant and recessive traits (you
don't need to memorize these because you will be provided with a key for each
problem):
Eye Color (Brown eyes: B, blue eyes: b)
Ear lobes (Free ear lobes : F, attached ear lobes : a )
Dominant handedness (Right handed : R, left handed : 1)
Chin (Cleft chin: C, no c1eft chin: c )
Height (Tallness: T, shortness : s )
Hair line (Widow's peak: W, no widow's peak:w)
Dimples (Smile dimples: D, no smile dimples: d)
Hair (Curly hair; C, straight hair : s )
-
2.) Take the descriptions of parents
alleles and properly place the alleles in a punnett
square (Example: 'The male is heterozygous for brown eyes and the female is
homozygous
pr
blue
eyes)
b
tsb bb
BU bb
b
b
\s-
B
3.) Determine probabilities of what the offspring willbe, based on the punnett square
(Example: 50o/o chaoce of being heterozygous for brown eyes and a 50Yo chance
of being homozygous for blue eyes; rc}% chance of carrying the hidden trait for
blue eyes)
6b bu
Bo bb
b
b
PRACTICE:
B
1.) Complete the punnett square:
a.\
',-,,
{
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B
B
bB
BB
b
Bu
BA
50% chance of beins homozvsous for
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b.) 50% chance of beins hetercnr
:ous
for
a
2.) Complete:
F'
a
Fa
fio..
GCL
&e\"
e
he{gnfqRUUS
a.)
Sr%chance of being
-T
forFree ear lobes.
b.)
50% chance of being
for attached ear lobes.
3.) Complete:
R
a.) 25
b.)
R
flR
t
flr
o/o chanceof
RI
It
being
homgu&ml,\
50% chance of being
f"rf|g[t-
handedness
fbr nqttts
'-_1J-_
handedness
c.) 25% chance of being
d,.) 75
o/o
c,hancethata
1e-C+
nhL'tt"
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-handed ehild will be seen.
handedness
e
4.)
*
*
Complete:
Male parent is homozrygous for NO CLEFT CHIN.
Female parent is homozygous for a Cleft Chin.
C
C
C.
C.
C
(,,
C"
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chance the offspring
ctQs+
will
be
chin.
a
s.) Complete:
* Male parent is homozygous dominant for Tallness.
* Female parent is heterozygous for Tailness.
Fa' i
\
t{
T
$
il {N
a.l
fr
Yo chancethat the offspring will be
y,chance
T-d!-
thattheoffspringwitlbe
hOnWS
r,,&,llttull
ffi y,chance that the offspring wiu be fufeAUagL*
".1
nriallfi'olto
d.)
_Yo
that the offspring
will
be short.
6.) Pick atrait from page #1 and complete:
* Male parent is homozygous / purebred for the recessive trait.
* Female parcntis heterozygous / hybrid for the dominant trait.
I
D
d
* Write 3 probabilities using the words heterozygous
a)
and homorygous.
5O"/. c]naffe 0T bolg hderoz{gru.} (or
dtrnpLoD
i
b.)
T;f oC b.$ hornuulacL) recesEt\}e-
c)
0i, 5C barrg l.urnc,rag6uJ dc,rtft",rck
(lass
Date
Genetics
One of the traits of pea piants that Mendel observed was seed shape. The seeds were either round
or wrinkled. Mendel observed that round seed shape (R) was dominant to the wrinkled shape (r).
Directions: Complete the Punnett squnre
t0
shlw
the possible offspring of two heterozyglus pea plnnts, Then
onswer the questians thot follow.
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What two forms of the trait for seed shape did Mendel observe?
shape
3. What percentage of the
ofboth parent plants?
possible types of offspring had the same geilgupe as the
p.t.""{ (i)
51o'1"
4. What
d
c
percentage of the possible tlpes of offspring were
5. What percentage of the possible
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c
G
o
E
g
o
co
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gqnotype of the offspring that did not share the parents'
6. What was the ,*
=*
(P . f f
types of of[spring had the same ghenotypels the parents?
-75*1"
I-r
si
oo
\gpglyggus?
Ko.-tnrilphenotype?
is the probability that two heterozygous parents would have an o
round seeds? (Express your answer as a ratio.)
7. What
o
3'i
c
a
:>
p
.9.
G
=
=:
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Directions: Answer the following questilns on the lines provided.
8. What is genetics?
o
o
c
o
(o
c
u
role do genes play?
o
oo
10.
What 3 principles of hereditv did Mendel
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