Modern Genetics

Which of these traits is controlled by a gene with multiple alleles?

• straight hairline

• smile dimples

• widow's peak

• blood type

What are multiple alleles?

• more than 2 genes that control a trait

• three or more forms of a gene that code for a single trait

• three or more chromosomes that determine a trait

• more than 2 codominant genes in a chromosome

Which of these human traits is altered by variations in environment?

• hairline

• height

• smile dimples

• blood type

Tags

NGSS.HS-LS3-2

What factors can affect a person's height?

• genes only

• both genes and environmental factors

• a person's blood type

• a person's karyotype

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which combination of sex chromosomes results in a male human being?

• XX

• YY

• XY

• either XX or YY

How does a geneticist use a pedigree?

• to create genetic crosses

• to replicate identical strings of DNA

• to prove that sex-linked traits are caused by codominant alleles

• to trace the inheritance of traits in humans

What is pedigree?

• a chart that tracks which members of a family have a particular trait

• a geneticist who studies the inheritance of traits in humans

• a picture of all the chromosomes of a cell

• an allele passed from parent to child on a sex chromosome

Genetic disorders are caused by

• pedigrees

• DNA mutations or changes in chromosomes

• dominant alleles only

• recessive alleles only

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

Which genetic disorder causes the body to produce unusually thick mucus in the lungs and intestines?

• hemophilia

• Down syndrome

• cystic fibrosis

• sickle-cell disease

What is a karyotype?

• a sex-linked genetic disorder

• a picture of a baby before it is born

• a picture of the chromosomes in a cell

• fluid that surrounds a baby before it is born