Genetics: Question Preview (ID: 2138)

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An allele whose trait ALWAYS shows up whenever the allele is present is a ___________ allele.
a) Dominant
b) Recessive
c) Heterozygous
d) Homozygous

A homozygous wild-type fly with red eyes (RR) mates with a homozygous sepia fly with brown eyes (rr). What are the chances that their offspring will have brown eyes?
a) 100%
b) 50%
c) 25%
d) 0%

What does it mean to be a carrier of a genetic disease?
a) You have one allele for the disease which you can pass on to your children, but you are healthy.
b) You have both alleles for the disease and exhibit all symptoms of the illness.
c) You do not have any disease alleles and cannot pass this disease on to your children.
d) Some of your cells carry the allele for the disease and other cells do not.

Which part of the cell contains the genetic material?
a) Cell membrane
b) Mitochondria
c) Nucleus
d) Lysosome

Gregor Mendel is called the "Father of Genetics." What did he discover?
a) He invented the microscope, allowing us to see cells for the first time.
b) He discovered the basic rules of inheritance by studying pea plants.
c) He discovered the chemical structure of DNA and won a Nobel Prize.
d) He invented a cure for sickle cell disease, which is a genetic disease.

What is the term for an organism that has two identical alleles for a particular trait?
a) Heterozygous
b) Dominant
c) Hybrid
d) Homozygous

Which combination of sex chromosomes would result in a male human being?
a) XX
b) YY
c) XY
d) XYZ

How many chromosomes do humans typically have in each body cell?
a) 12
b) 23
c) 36
d) 46

The base pairs of DNA are adenine, cytosine, guanine, and thymine. Which bases are correctly paired?
a) Adenine binds with cytosine.
b) Adenine binds with thymine.
c) Guanine binds with thymine.
d) Guanine binds with adenine.

If your DNA becomes mutated, what might be the result?
a) The mutation could be harmful.
b) The mutation could be helpful.
c) The mutation could have no affect.
d) All of the above are possible.

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