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

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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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