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Sara And Chris Genetics Chapter 4
Test Description: Genetics Chapter 4 study. See study guide for answers.
Instructions: Answer all questions to get your test result.
1) Which of these traits is controlled by a gene with multiple alleles?
A
smile dimples
B
blood type
C
straight hairline
D
widow\'s peak
2) What are multiple alleles?
A
more than two genes that control a trait
B
three or more chromosomes that determine a trait
C
more than two codominant genes in a chromosome
D
three or more forms of a gene that code for a single trait
3) Why does height in humans have such a wide variety of phenotypes?
A
height is controlled by at least four genes.
B
Height is controlled by sex-linked genes.
C
The gene for height has only two alleles.
D
Height is controlled by a recessive allele.
4) What controls variations in skin color among humans?
A
at least three genes
B
a person’s diet
C
two alleles of a single gene
D
multiple alleles of a single gene
5) Which of these human traits is altered by variations in environment?
A
hairline
B
blood type
C
height
D
smile dimples
6) What factors can affect a person’s height?
A
genes only
B
the sex chromosomes a person inherits
C
environmental factors only
D
both genes and environmental factors
7) Which combination of sex chromosomes results in a male human being?
A
YY
B
either XX or YY
C
XY
D
XX
8) Why are sex-linked traits more common in males than in females?
A
to create genetic crosses
B
to trace the inheritance of traits over generations of families
C
to prove that sex-linked traits are caused by codominant alleles
D
to replicate identical strings of DNA
9) Why are sex-linked traits more common in males than in females?
A
All alleles on the Y chromosome are recessive.
B
A recessive allele on the X chromosome will always produce the trait in a male.
C
Any allele on the Y chromosome will be codominant with the matching allele on the X chromosome.
D
All alleles on the X chromosome are dominant.
10) What is a pedigree?
A
a picture of all of the chromosomes in a cell
B
an allele passed from parent to child on a sex chromosome
C
a geneticist who studies the inheritance of traits in humans
D
a chart that tracks which members of a family have a particular trait
*select an answer for all questions
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