Sara And Chris Genetics Chapter 4: Question Preview (ID: 928)

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Which of these traits is controlled by a gene with multiple alleles?
a) smile dimples b) widow\'s peak c) blood type d) straight hairline
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) more than two codominant genes in a chromosome d) three or more chromosomes that determine a trait
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 a recessive allele. c) Height is controlled by sex-linked genes. d) The gene for height has only two alleles.
What controls variations in skin color among humans?
a) at least three genes b) two alleles of a single gene c) multiple alleles of a single gene d) a person’s diet
Which of these human traits is altered by variations in environment?
a) hairline b) height c) blood type d) smile dimples
What factors can affect a person’s height?
a) both genes and environmental factors b) the sex chromosomes a person inherits c) environmental factors only d) genes only
Which combination of sex chromosomes results in a male human being?
a) XX b) either XX or YY c) XY d) YY
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 replicate identical strings of DNA d) to prove that sex-linked traits are caused by codominant alleles
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) All alleles on the Y chromosome are recessive. d) A recessive allele on the X chromosome will always produce the trait in a male.
What is a pedigree?
a) a chart that tracks which members of a family have a particular trait b) a picture of all of the chromosomes in a cell c) a geneticist who studies the inheritance of traits in humans d) an allele passed from parent to child on a sex chromosome
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