Chapter 4 Review By Ben Meister Question Preview (ID: 931)

Best Quiz Ever BY BEN MEISTER.

Which of these traits is controlled by a gene with multiple alleles?
a) Straight Hairline
b) Smile Dimples
c) Widows Peak
d) Blood Type

What are multiple alleles?
a) More than two genes that control a trait
b) Three or more forms of a gene that code for a single trait
c) Three or more chromosomes that determine a trait
d) More than two codominant genes in a chromosome

Why does height in humans have such a wide variety of phenotypes?
a) Height is controlled by at least four genes.
b) The gene for height has only two alleles.
c) Height is controlled by sex-linked genes.
d) Height is controlled by a recessive allele.

What controls variations in skin color among humans?
a) A person’s diet
b) At least three genes
c) Multiple alleles of a single gene
d) Two alleles of a single gene

Which of these human traits is altered by variations in environment?
a) hairline
b) height
c) smile dimples
d) blood type

What factors can affect a person’s height?
a) genes only
b) environmental factors only
c) both genes and environmental factors
d) the sex chromosomes a person inherits

Which combination of sex chromosomes results in a male human being?
a) YY
b) XX
c) XY
d) YX

Why are sex-linked traits more common in males than in females?
a) All alleles on the X chromosome are dominant.
b) All alleles on the Y chromosome are recessive.
c) A recessive allele on the X chromosome will always produce the trait in a male.
d) Any allele on the Y chromosome will be codominant with the matching allele on the X chromosome.

How does a geneticist use pedigrees?
a) to create genetic crosses
b) to replicate identical strings of DNA
c) to prove that sex-linked traits are caused by codominant alleles
d) to trace the inheritance of traits over generations of families

What is a pedigree?
a) a chart that tracks which members of a family have a particular trait
b) a geneticist who studies the inheritance of traits in humans
c) a picture of all of the chromosomes in a cell
d) an allele passed from parent to child on a sex chromosome

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