Transcript Genetics Review

Ms. Edmondson
Question #1
What does the term phenotype
mean?
Answer:
How a trait appears/looks
Question #2
What does the term genotype
mean?
Answer:
The group of genes that make up
a trait (the letters)
Question #3
What does a capital letter mean?
Answer:
It means the allele is dominant
Question #4
If an allele is recessive how many
copies of the allele are needed
for it to be expressed?
Answer:
Two copies
(aa-one from mom and one from dad)
Question #5
What type of alleles are known as
‘loud and bossy’?
Answer:
Dominant alleles
Question #6
Purple flowers (P) are dominant to
white flowers. Write the
genotype of a heterozygous
purple flower.
Answer:
Pp
Question #7
Purple flowers (P) are dominant to
white flowers. If a white flower
is crossed with a heterozygous
purple flower, what is the chance
of having white flowers?
p
P
Answer: 50%
p Pp
pp
p
pp
Pp
Question #8
Purple flowers (P) are dominant to
white flowers. If two
heterozygous flowers are
crossed, what is the chance of
having white flowers?
p
P
Answer: 75%
P PP
Pp
p
pp
Pp
Question #9
Is AA, heterozygous, homozygous
dominant or homozygous
recessive?
Answer: heterozygous dominant
Question #10
If red colored dragons are
dominant to orange colored
dragons what is the phenotype for
a dragon who is Rr?
Answer: Red
Question #11
If red colored dragons are
dominant to orange colored
dragons what is the genotype for
a dragon who is orange (use R)?
Answer: rr
Question #12
What is another name for
homozygous?
Answer: Purebred
Question #13
What is another name for hybrid?
Answer: Heterozygous
Question #14
In Oompa Loompahs, gray faces
(G) are dominant to orange. If a
homozygous gray faced male
married a heterozygous gray
female and they have 6 kids,
about how many will have gray
G
G
faces?
G GG GG
Answer: ½ * 6 = 3
g Gg
Gg
Question #15
Two heterozygous Oompahs are
crossed. What proportion of the
offspring will have orange faces?
Answer: 75%
G
g
G GG Gg
g Gg
gg
Question #16
In a certain type of fish there are
three possible alleles; red, orange, and
yellow. Orange is the intermediate of
red and orange. Assuming red is R and
yellow is Y, what is the genotype for
the orange fish?
Answer: RY
Question #17
In these same fish where
RR- Red, RY- Orange, and YY- Yellow,
what are all of the possible
phenotypes of an orange fish is mated
with a yellow fish?
R
Y
RY
YY
Y RY
YY
Answer: orange and yellow Y
Question #18
In these same fish where
RR- Red, RY- Orange, and YY- Yellow,
what are all of the possible genotypes
if two orange fish are mated?
Answer: RR, RY, YY
R
Y
R RR
RY
Y RY
YY
Question #19
In these same fish where
RR- Red, RY- Orange, and YY- Yellow,
what are the chances of having yellow
fish if a red fish is mated with a
yellow fish?
Answer: 0%, all would be
orange
R
R
Y RY
RY
Y RY
RY
Question #20
R is red and W is white in 4 o’clocks.
If a pink flower is crossed with a red
flower what are the chances of
getting red flowers?
Answer: 50% chance
R
W
R RR RW
R RR RW
Question #21
In heffalumps, pink (P) and yellow (Y)
are equally dominant, the
heterozygote is spotted. If two
spotted heffalumps are mated, what
are the changes of getting the yellow
gene?
Answer: 25% chance
P
Y
P PP
PY
Y PY
YY
Question #22
In heffalumps, pink (P) and yellow (Y)
are equally dominant, the
heterozygote is spotted. If a pink
heffalump is mated with a spotted
heffalump, what are the changes of
getting the yellow gene?
Answer: 0% chance
P
Y
P PP
PY
P
PY
PP
Question #23
In some cattle the color roan is a
mixture of red (R) and white (W)?
What are the genotypes for the
following colors:
Red- ____ White- ____ Roan- __
Answer: RR, WW, RW
Question #24
In some cattle the color roan is a
mixture of red (R) and white (W)? If
a red cow and a white bull are mated,
what are the chances of having roan
babies?
Answer: 100%
R
R
W RW RW
W RW RW
Question #25
In humans, blood type is a classic
example of a trait inherited by
multiple alleles. What does multiple
alleles mean?
Answer: There are more than two
alleles for a trait (within a
population).
Question #26
In humans, blood type is a classic
example of a trait inherited by
multiple alleles. How many different
alleles are there?
Answer: 3
Question #27
In humans, blood type is a classic
example of a trait inherited by
multiple alleles. What are the three
alleles possible?
Answer: A, B, and O
Question #28
In humans, blood type is a classic
example of a trait inherited by
multiple alleles. How many alleles does
each person receive?
Answer: 2, one from mom and one
from dad
Question #29
Complete the following:
Blood Types ____ and ____ are
dominant over Type O
Answer: A and B
Question #30
Complete the following:
Blood Types ____ and ____ are
codominantly expressed, meaning they
are expressed together
Answer: A and B
Question #31
What blood type is known as the
universal donor and why?
Answer: Type O blood, because it
has no antigens on its surface and
therefore can be given to any
person
Question #32
What blood type is known as the
universal receiver and why?
Answer: Type AB blood, because
it will not react poorly to antigen
A or B and a person with this
blood type can receive a
tranfusion from anyone
Question #33
If a mother is homozygous for type A
blood and a father is heterozygous for
type B blood, what are the chances of
having a child with type O blood?
Answer: 0%
A
A
B AB AB
O AO AO
Question #34
If a mother has type B blood and her
son has type O blood is the mother
homozygous B or heterozygous B?
Answer: Heterozygous, because
he had to get one O from dad and
one O from mom
Question #35
A woman and her husband claim that
their child was mixed up on the hospital
because of its dark hair. The mother
has type B blood and the father has type
A blood. The alleged child has type O
blood. Should the parents be concerned?
Answer: No, the mom and dad could
both be heterozygous resulting in a
child with type O blood.