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Chapter 4 Review By Ben Meister
Test Description: Best Quiz Ever BY BEN MEISTER
Instructions: Answer all questions to get your test result.
1) Which of these traits is controlled by a gene with multiple alleles?
A
Blood Type
B
Smile Dimples
C
Widows Peak
D
Straight Hairline
2) What are multiple alleles?
A
Three or more chromosomes that determine a trait
B
Three or more forms of a gene that code for a single trait
C
More than two genes that control a trait
D
More than two codominant genes in a chromosome
3) Why does height in humans have such a wide variety of phenotypes?
A
Height is controlled by a recessive allele.
B
The gene for height has only two alleles.
C
Height is controlled by at least four genes.
D
Height is controlled by sex-linked genes.
4) What controls variations in skin color among humans?
A
Two alleles of a single gene
B
Multiple alleles of a single gene
C
A person’s diet
D
At least three genes
5) Which of these human traits is altered by variations in environment?
A
blood type
B
hairline
C
smile dimples
D
height
6) What factors can affect a person’s height?
A
environmental factors only
B
the sex chromosomes a person inherits
C
both genes and environmental factors
D
genes only
7) Which combination of sex chromosomes results in a male human being?
A
XY
B
XX
C
YY
D
YX
8) Why are sex-linked traits more common in males than in females?
A
Any allele on the Y chromosome will be codominant with the matching allele on the X chromosome.
B
All alleles on the X chromosome are dominant.
C
A recessive allele on the X chromosome will always produce the trait in a male.
D
All alleles on the Y chromosome are recessive.
9) How does a geneticist use pedigrees?
A
to prove that sex-linked traits are caused by codominant alleles
B
to create genetic crosses
C
to trace the inheritance of traits over generations of families
D
to replicate identical strings of DNA
10) What is a pedigree?
A
an allele passed from parent to child on a sex chromosome
B
a geneticist who studies the inheritance of traits in humans
C
a picture of all of the chromosomes in a cell
D
a chart that tracks which members of a family have a particular trait
*select an answer for all questions
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