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Genetics ReviewPart 2
If a characteristic is sex-linked, it occurs more frequently in _______.
•Males
What is a diagram that shows how a
characteristic is passed through a family?
•Pedigree
What are the X and Y chromosomes called?
•Sex chromosomes
What are chromosomes pairs1-22 called?
•Autosomes
What is an individual that doesn’t express a given
trait but can pass it to it’s offspring?
•carrier
Red green color blindness is a sex-linked recessive trait . In a family the father is color blind and the
mother is a carrier.Show your work for this cross
XBXb XBY
XbXb XbY
XB
Xb
Xb Y
Red green color blindness is a sex-linked recessive trait . In a family the father is color blind and the
mother is a carrier.What is the genotype for the father?
XrY
Red green color blindness is a sex-linked recessive trait . In a family the father is color blind and the
mother is a carrier.Out of 4 children, how many girls would be expected to be color blind?
1
Red green color blindness is a sex-linked recessive trait . In a family the father is color blind and the
mother is a carrier.Out of 4 children, how many boys would be expected to be color blind?
1
What gender determines the sex of an offspring?
•Male
What is the gender of this karyotype?
Male
What genetic condition does this person have?
Down Syndrome Trisomy 21
What is the gender of this karyotype?
Male
Is this karyotype considered “normal”?
No
How many blood types are there?
•A•B•AB•O
How many alleles do you have for blood type?
•2
Blood types A and B are expressed equally; they
are
•codominant
If 2 people have AB blood, what is the
probability they will have an offspring with
AB•50%
What is true about the Y chromosome compared
to the X?
It is shorter than the X
What causes an organism to receive too
many or too few chromosomes?
•nondisjunction
Sex-linked genes refer to what chromosome?
•X
How many chromosomes does a person with Down
Syndrome have?
•47
A male can produce sperm that is either ___
or ___.
•X Y
If both parents carry the recessive allele what is the chance that their child will inherit the genetic autosomal
condition?
•25%
Which Punnett Square is worked out correctly?
•
XB XB
XBXB
Y
XB XBXB
XBYB XBY
XB XB
XBXB
Y
XB XBXB
XBY XBY
XB Xb
XBXB
Y
XB XBXB
XBY XbY
Which Punnett Square is worked out correctly?
•
X X
XX XX
XY XXY
X
X X
XX XX
XX XYY
X
X X
XX XX
XY XYY
X
_____________is a mutation where an organism has an extra chromosome.
•Trisomy
Males have the sex chromosomes…
XY
Based on the pedigree shown, what is the genotype of person II-7?
Bb
Based on the pedigree shown, how many Daughters do the original parents have?
1
Sample pedigree - cystic fibrosis1. What can we say about I-1 and I-2?
2. What is the inheritance?
3. What are the odds that III-5 is a carrier?
4. What is the relationship between I-1and III-4?
5. Which individuals are affected with cystic fibrosis?
Which parent determines the gender of the child?
Father
What is any characteristic passed
from parent to offspring?
•A Trait
How do we represent the allele for a recessive
trait?
•Lowercase letter
A section of a chromosome that codes
for a trait is a
•Gene
What is the likelihood that a particular event
will occur?
•Probability
What is the genetic makeup of an organism
called?
•Genotype
The branch of Biology that deals with heredity
•Genetics
Passing of traits from parent to offspring
•Heredity
An allele that expresses itself in a hybrid is
a(n)_________.
•Dominant allele
All of the possible results of a genetic cross
can be shown by using what tool?
•Punnett Square
What is the term for the physical appearance
that an organism expresses?
•Phenotype
On a separate sheet of paper• Draw a pedigree that represents Julie
married to Jeff, with one daughter, Josephine. Josephine married Joseph and had Jason and Joe. Joe married Julia and had Shannon and fraternal twin boys, Mark and Alex. Mark married Alison and had Ray and Scarlet. Please label the pedigree with the names of the people.
• The individuals in red are affected with an autosomal recessive disorder. Please indicate the genotypes of each person in this pedigree
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