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Science>Biology>Genetics Practice Problems, Solve Problem Exercises
Genetics Practice Problems
(single trait crosses)
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Courtesy of The Biology Binder
Pictured above is an alien who displays all of the dominant
characteristics of its species. Below is a chart listing various traits
found in this alien race. Use the information in the chart to solve the
genetics problems that follow.
| Body color |
(Y) Yellow |
(y) Orange |
| Number of Antennae |
(A) 2 |
(a) 1 |
| Eye color |
(P) Purple |
(p) White |
| Eyesight |
(E) Glasses
needed |
(e) Glasses
not worn
|
| Number of Body Rings |
(R) 3 |
(r) 5 |
1. A heterozygous male mates
with a pure yellow female. What is the chance this couple will produce an
orange baby? Check your answer
2. Two purple-eyed aliens mate. Both aliens are
hybrid for the eye color trait. What is the chance this couple will produce a baby with
a homozygous recessive genotype? Check your answer
3. A heterozygous female with 3 body rings mates with a
5-ringed male. What is the chance that this couple will have a baby that
looks like its mother? Check your answer
4. A pure male alien displaying the dominant body color
mates with a female that is homozygous recessive for this characteristic.
What is the chance that this couple will have a baby with a hybrid genotype? Check your answer
5. A male alien with 1 antenna mates with a female alien
who has 2 antennae. The female is heterozygous for the antenna
trait. What is the chance that this couple will produce a baby with the
recessive phenotype? Check your answer
6. An alien couple, both of which wear glasses, are having
a baby. The male's genotype is heterozygous. The female is
phenotypically dominant but does carry the recessive allele. What is the
chance that this couple's baby will have to wear glasses? Check your answer
7. A 3-ringed female mates with a homozygous male.
The female has been genetically tested and is carrying both the dominant and the
recessive allele for this trait. The male displays the recessive
phenotype. What is the chance that this couple will have a genetically
pure baby? Check your answer
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