Intro Genetics Review

What did Gregor Mendel do to study different characteristics in his genetics experiments?

• He studied only asexual plants.
• He studied only tall and short pea plants.
• He cross-pollinated plants.
• He cross-pollinated both plants and animals.

In Mendel's experiments, what proportion of the plants in the F₂ generation had a trait that had been absent in the F₁ generation?

• none
• one fourth
• half
• three fourths

Who dressed like Santa to bring around treats?

• Mr. Morgan

• Mr. Jones

• Mr. Pfeifer

• Mr. Mann

Factors that control traits are called

• genes.
• purebreds.
• recessives.
• parents.

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Scientists call an organism that has two different alleles for a trait a

• hybrid.
• trait.
• purebred.
• factor.

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What does the notation TT mean to geneticists?

• two dominant alleles
• heterozygous alleles
• at least one dominant allele
• one dominant and one recessive allele

What does the notation Tt mean to geneticists?

• two dominant alleles
• two recessive alleles
• homozygous alleles
• one dominant allele and one recessive allele

What is the chromosome theory of inheritance?

• Chromosomes are carried from parents to offspring on hybrids.
• Genes are carried from parents to offspring on chromosomes.
• Hybrid pairs of chromosomes combine to form offspring.
• Codominant genes combine to form new hybrids.

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Walter Sutton discovered that the sex cells of grasshoppers have

• 12 times the number of chromosomes found in the body cells.
• twice the number of chromosomes found in the body cells.
• the same number of chromosomes found in the body cells.
• half the number of chromosomes found in the body cells.

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What happens during meiosis?

• Two sex cells combine.
• Chromosome pairs separate and are distributed into new sex cells.
• Each sex cell copies itself to form four new chromosomes.
• Chromosome pairs remain together when new sex cells are formed.