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Genetic review
The diagram above represents the chromosomes of a person with a
genetic disorder caused by nondisjunction, in which the
chromosomes fail to separate properly. Which chromosome set
displays nondisjunction?
•
An illustration of a person’s chromosomes that can be analyzed for
the presence of diseases is called a __________.
•
A __________ occurs when one chromosome from a pair is missing.
•
A __________ occurs when there is an extra, or third, chromosome
for one pair.
•
A disorder that occurs when there is an extra 21st chromosome,
and that results in varying degrees of mental retardation, is called
__________ Syndrome.
•
The genetic make-up of an organism is its
_______________whereas its physical characteristics is its
________________.
The genotype of
individual 1 could be
The genotype of
individual 2 could be
Punnett square
Tom is colorblind (sex-linked on the X chromosome) and is married to
Barbara, who is normal, is expecting another child. What is the
probability that their new baby will be colorblind?
A genetic pedigree showing that only males are affected by a
certain disorder is evidence of what type of inheritance?
In humans, the gene for polydactyly (having extra fingers or toes) is
dominant over the gene for the normal number of digits. If parents
who are both homozygous dominant for polydactyly have four
children, how many of these children would most likely have extra
fingers or toes?
What trait will most likely be observed in all offspring of the above set of
parents?
Which of the following scientist is know as the “Father of Genetics”?
When red and white snapdragons are crossed their offspring are pink.
This is an example of ______________.
The term that is used when both alleles contribute to the phenotype (such
as in chickens with both black and white feathers).
Duchene muscular dystrophy is a genetic disorder. It results from a mutation in the gene that
code for a protein necessary for muscle strength.
A geneticist prepared a pedigree for a family in which the disorder is present in some
members.
. According to this information, what type of allele is responsible for Duchene
muscular dystrophy?
1.
2.
3.
4.
Autosomal recessive allele
Autosomal dominant allele
Sex-linked recessive
Sex-linked dominant