Biology: Mendellian Genetics

Gregor Mendel used pea plants to study...

• flowering

• gamete formation

• the inheritance of traits

• cloning

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The “factors” that are passed from parent to offspring and determine traits are called...

• genes

• characteristics

• traits

• alleles

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Gregor Mendel concluded that traits are...

• not inherited by offspring

• passed from the parents to the offspring

• determined by dominant factors only

• determined by recessive factors only.

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The principle of dominance states that...

• all alleles are dominant.

• all alleles are recessive.

• some alleles are dominant and others are recessive.

• alleles are neither dominant nor recessive.

A tall plant is crossed with a short plant. If the tall F1 pea plants are allowed to self-pollinate,

• the offspring will be of medium height.

• all of the offspring will be tall.

• all of the offspring will be short.

• some of the offspring will be tall, and some will be short.

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Organisms that have two identical alleles for a particular trait are said to be...

• homozygous

• dominant

• heterozygous

• hybrid

When Gregor Mendel crossed a tall plant with a short plant, the F1 plants inherited...

• an allele for tallness from each parent.

• an allele for tallness from the tall parent and an allele for shortness from the short parent.

• an allele for shortness from each parent.

• an allele from only the tall parent.

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A pea plant that has two different alleles for the same trait is said to be..

• polygenic

• heterozygous

• homozygous

• heptazygous

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The different forms of a gene are called...

• chromatids

• genes

• alleles

• homologous chromosomes

What do we know about two plants with the genotypes TT and Tt?

• would have the same phenotype

• have all dominant alleles

• would have different phenotypes

• have all recessive alleles

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