Download offspring lab

Biology I
Name___________________________
Lab Experiment: Genetics
Date______________
Pd________
It’s a boy (and a girl)!!
Background:
This should contain a description of genes and how we pass them on to our offspring. Include
dominance and recessiveness and also a description of the genetic disorder you have been assigned,
including its symptoms and how it is genetically passed. You will need to do some research on this.
Objective: To determine some of the genetic traits your children may carry.
Materials:
Procedure:
1. Can you roll your tongue into a U-shape? Try it. If you can, then you possess the dominant gene (RR
or Rr). If you can't roll your tongue, you have two recessive alleles.
2. Have a partner examine your earlobes. If they hang free at the bottom, you have a dominant allele
(FF or Ff). If they are attached, you have two recessive alleles.
3. Fold your hands together by interlocking your fingers. Which thumb is on top? If the left thumb is on
top, you are dominant (LL or Ll), if the right thumb is on top, you are recessive.
4. When you have tried all three previous steps choose two to include in your genetic traits. If you can,
choose one for which you are recessive. You will do a dihybrid cross for the two traits you choose.
5. You will also include blood type. If you don’t know your blood type, ask your parents. If they are
not sure of yours, then ask them what theirs is and choose a probable blood type based on your parents’
known types.
6. The last thing you will include in your genetics lab is a genetic disorder. Once you have a partner for
this “marriage”, you will be given alleles for a genetic disorder that may be passed to your “offspring”.
Observations:
This will be Punnett squares for each of four included traits (2 of the first three mentioned, blood type,
and the genetic disorder. If you want to include some genetic trait that you have and substitute it for the
first three above—see me. You will include a summary of the probable outcomes and explain which
will represent your two children. ( a boy and a girl!!) Congratulations
You will need to do one dihybrid cross for the first traits and the others will be done as monohybrid
crosses.
Conclusions:
You don’t have questions for this. Rather write a three+ paragraph conclusion about what you learned
about genetics from this activity and how it has added to your understanding from Chapter 9. Be sure to
include genetic disorders in your conclusion and a definition of carrier. Depending on your disorder
you will need to include: sex-linked, autosomal recessive (or dominant) or nondisjunction.
Possible genetic disorders:
Hemophilia
Color blindness
Huntington’s disease
Duchenne Muscular Dystrophy
Sickle cell anemia
Cystic fibrosis
Tay Sachs
Down syndrome
One partner has an
allele for
Huntington’s
Disease
One of you has
sickle cell anemia,
and the other is a
carrier for it.
Both of you are
carriers of cystic
fibrosis.
Both of you are
carriers of tay
sachs.
The wife is a
carrier of
hemophia
The wife is a
carrier of
hemophia
The wife is a
carrier of
Duchenne
Muscular
Dystrophy.
Both of you have
Down syndrome.
The wife is a
carrier of
Duchenne
Muscular
Dystrophy.
One partner has an
allele for
Huntington’s
Disease
The husband is
The wife is color
color blind and the blind.
wife is a carrier.
Both of you are
carriers of cystic
fibrosis.
The husband is
color blind.
Both of you are
carriers of tay
sachs.
The husband is
color blind.
Both of you are
carriers of cystic
fibrosis.
One of you has
sickle cell anemia,
and the other is a
carrier for it.
The husband is
One of you has
color blind and the sickle cell anemia,
wife is a carrier.
and the other is a
carrier for it.
Both of you are
carriers of tay
sachs.
The wife is a
carrier of
Duchenne
Muscular
Dystrophy.
The husband is
The husband has
color blind and the hemophilia.
wife is a carrier
One partner has an
allele for
Huntington’s
Disease
One partner has an
allele for
Huntington’s
Disease
The wife is a
carrier of
Duchenne
Muscular
Dystrophy.
One of you has
sickle cell anemia,
and the other is a
carrier for it.
Both of you have
Down syndrome.
Both of you are
carriers of cystic
fibrosis.
One of you has
sickle cell anemia,
and the other is a
carrier for it.
One of you has
sickle cell anemia,
and the other is a
carrier for it.