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Genetics
Whiteboard review
Vocabulary
Different forms of a gene are
called
A. Hybrid
B. Dominant factors
C. Alleles
D. Recessive factors
Who is considered to be the “Father of
Genetics”?
A.Mendeleev
B.Mendel
C.Stephen Hawkings
D.Alfred Einstein
E.Watson and Crick
F. Chargaff
Vocabulary
Two identical alleles for a trait
such as “GG” or “gg” are said
to be:
A.Hybrid
B.Heterozygous
C.Homozygous
D.Dominant
Vocabulary
A punnett square is used to
determine the
A.Probable outcome of a cross
B.Actual outcome of a cross
C.Result of incomplete
dominance
D.Result of meiosis
Vocabulary
Physical characteristics of an
organism are called
A.genetics
B.heredity
C.phenotype
D.genotype
Vocabulary
An example of genotype of an
organism is
A.gg
B.Green
C.How tall it is
D.When red and white make pink
This karotype is from a
A. Human (23 pairs)
B. Mouse (20 pairs)
C. Cat (19 pairs)
D. Horse (32 pairs)
Boy or girl?
Alleles for the same trait are
separated from each other during
the process of
A.Cytokinesis
B.Meiosis
C.Mitosis
D.Mitochondrial respiration
• The unknown genotype is?
• What % will be have axial stems
if “A” is dominant?
• What will the ratio be?
Sickle cell a recessive disorder.
If the first child of two healthy
parents has sickle cell. What is
the probability the second child
will also have sickle cell
A.1 in 500
B.1 in 250
C.1 in 4
D.0
Monohybrid cross
• You are given two purebred
black mice, How many white
mice can you produce?
• Given a pure black mouse, and a
pure white mouse, can you
produce a black mouse? Black
is a dominant trait. Show the
cross to prove your answer.
• If you breed two white mice,
can you get a black mouse?
Monohybrid crosses
• If two amber eyed parents that
have both a dominant and
recessive allele (Aa) are
crossed, what is the probability
of having a red-eyed offspring?
Monohybrid cross
• Red hair is a recessive trait. A
mom has red hair and married a
guy with brown hair. The couple
had one red hair boy and a brown
haired girl. Show a punnett
square where this is possible.
Give the possible genotypes and
phenotypes of all offspring.
• What is the phenotypic ratio of
brown hair vs red hair?
Monohybrid crosses
• Two pea plants with smooth seeds
are crossed. Some of the offspring
have wrinkled seed pods.
• What can you infer about the
genotype of both parents?
• What is the dominant trait and what
is the recessive trait?
• Would this be an example of
complete dominance, incomplete
dominance, or codominance?
Suppose Mendel crossed 2 pea
plants and got BOTH tall and
short offspring.
Which would NOT be a
possible cross?
A. Tt x tt
B. Tt x Tt
C. TT x tt
D. tt x Tt
• If you cross Tt x Tt plants what
will the phenotype ratio be?
Thinking critically
• In guinea pigs the allele for a
rough coat ® is dominant over a
smooth coat (r). A
heterozygous guinea pig (Rr)
and a homozygous recessive
guinea pig (rr) have 9 babies.
All are smooth coated.
• Is this possible?
• Is it probable?
Vocabulary
• A gene with more than two
alleles (forms of a gene/trait
expressed) is considered
A.Codominant
B.Incompletely dominant
C.To have multiple alleles
D.To have polygenic traits
Multiple alleles
• A woman with type B blood had
both parents with type AB
blood. The woman married a
guy with type A blood whose
mother had type O blood. Do a
punnett square of this cross to
determine the possible
genotypes and phenotypes for
this trait.
Vocabulary
• I cross a yellow bird and a blue
bird. The offspring are all
green.
• This would be an example of:
A.Complete dominance
B.Codominance
C.Incomplete dominance
D.None of the above
• A yellow bird and a blue bird
make all green offspring. I bred
two green birds (not brother and sister from before
but from completely different bird families).
What color
will their babies be? Do the
punnent square to prove your
answer.
• Two pink flowering plants are
crossed. The offspring are
25% red, 25% white, and 50%
pink. What pattern of
inheritance does flower color
in these flowers follow?
A.Complete dominance
B.Codominance
C.Incomplete dominance
D.None of the above
Sex-linked
• A woman had a colorblind
father, but was not colorblind
herself. She married a
colorblind guy. Do a punnett
square of this cross to
determine the possible
genotypes and phenotypes for
this trait.
Dihybrid
• A man with normal pigmentation and
wooly hair (which is dominant)
marries a woman with normal
pigmentation and normal hair. Their
first child is an albino with normal
hair. Albinism is a recessive trait.
• A=normal, a=albino, F=wooly hair,
f=normal hair
• What is the genotype of the man?
______________
• What is the genotype of the woman?
_______________
Dihybrid cross
• A man with normal pigmentation and
wooly hair (which is dominant)
marries a woman with normal
pigmentation and normal hair. Their
first child is an albino with normal
hair. Albinism is a recessive trait.
• A=normal, a=albino, F=wooly hair,
f=normal hair
• Do FOIL to find the possible gametes
for the parents.
Vocabulary
• A trait controlled by two or
more genes working at the
same time is considered
A.Codominant
B.Incompletely dominant
C.To have multiple alleles
D.A polygenic traits
Vocabulary
• I cross a white bunny and a
black bunny and get cute little
black and white baby bunnies.
• This would be an example of:
A.Complete dominance
B.Codominance
C.Incomplete dominance
D.None of the above
Dihybrid crosses
• Try breeding a pure white/red
eyed mouse with a pure black
/amber eyed mouse.
• What will be the probable
genotype and phenotypes of the
offspring?
• Show a punnet square for the second
cross. BbAa x BbAa. What
phenotypes are present and in what
proportion (ratio).
• Your punnet squares shows 16
possibilities. If the mice had 160
babies. Calculate how many of each
phenotype you could expect. Hint,
multiply by 10.
• _______ out of 160 White fur, amber
eyes
_______ out of 160 White fur, red eyes
_______ out of 160 Black fur, amber
Is this disorder
A. Dominant
B. Recessive
C. Sex-linked
Is this disorder
A. Dominant
B. Recessive
C. Sex-linked
Is this disorder
A. Dominant
B. Recessive
C. Sex-linked