Genetics Review Question Preview (ID: 35575)

Review Of Punnett Squares, Pedigrees, Genetics Disorders, And Vocabulary Terms.

An organism's genotype is its
a) genetic makeup
b) physical appearance
c) trait
d) feather color

The passing of physical characteristics from parents to offspring is known as
a) genetics
b) heredity
c) genes
d) chromosomes

Factors that control traits are called
a) genes
b) alleles
c) purebred
d) hybrid

What is a pedigree?
a) a picture of all the chromosomes within a cell
b) a geneticist who studies the inheritance of traits in humans
c) a chart that tracks which members of a family have a particular trait
d) A tool used to show genotypes and phenotypes of future offspring

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

An organism with two identical alleles for a trait is called a(n)
a) purebred
b) heterozygous
c) hybrid
d) phenotype

Genetic disorders are caused by
a) dominant alleles only
b) recessive alleles only
c) DNA mutations or changes in chromosomes
d) pedigrees

A carrier is a person who has
a) two dominant alleles for a trait
b) one dominant allele and one recessive allele for a trait
c) two recessive alleles
d) two unknown alleles

A purebred chicken with white feathers is crossed with purebred chicken that has black feathers. Each of their offspring have both black and white feathers. Why does this happen?
a) The alleles are both recessive
b) The alleles are both dominant
c) Several alleles work together to determine the trait
d) The alleles are an example of incomplete dominance

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

What is a mutation?
a) any change that is helpful to an organism
b) any change that is harmful to an organism
c) any change in a gene or a chromosome

An organism's physical appearance is its
a) genotype
b) phenotype
c) heterozygous
d) homozygous

Chromosomes are made up of
a) RNA
b) cells
c) many traits joined together
d) many genes joined together

What does the notation Bb mean to geneticists?
a) homozygous alleles
b) two dominant alleles
c) two recessive alleles
d) one dominant and one recessive allele

An allele in which a trait always shows up when the allele is present is called
a) dominant
b) recessive
c) codominant
d) incomplete dominance

When sex cells combine to produce offspring, each sex cell will contribute
a) half the number of chromosomes
b) one fourth the number of chromosomes
c) the normal number of chromosomes

Many characteristics are affected by interactions between genes and
a) alleles
b) carriers
c) the environment
d) pedigrees

Sex-linked genes are genes found on
a) the Y chromosome only
b) the X chromosome only
c) both the X and Y chromosomes
d) all 23 pairs of chromosomes

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