Genes, Traits, and Heredity (and Reproduction)

How does the number of chromosomes in gametes (sex cells) compare with the number of chromosomes in all other cells?

• Gametes have twice as many chromosomes

• Gametes have 1/4 the number of chromosomes

• Gametes have 1/2 the number of chromosomes

• Gametes have twice as many chromosomes

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One cat has a heterozygous genotype, black fur (Bb), and its mate has a homozygous genotype grey fur (bb). Use a Punnett square to determine the probability of one of their offspring having grey fur.

• 100%

• 25%

• 50%

• 75%

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What is formed as a result of mitosis?

• four genetically different cells

• four genetically identical cells

• two genetically different cells

• two genetically identical cells

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Which summarizes the genetic research completed by the Austrian monk Gregor Mendel?

• After years of research, Mendel identified the genes for flower colors.

• Mendel bred various dog breeds to discover the science of genetics.

• Mendel hypothesized that the offspring of pea plant traits are inherited.

• Using Punnett squares, Mendel developed the principles of genetics.

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Which is a tool that is used to predict genetic crosses?

• a slide rule

• a tally sheet

• a Punnett square

• a Venn diagram

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The observable expression of an allele pair is called the _________.

• recessive gene

• genotype

• phenotype

• monohybrid cross

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Meiosis produces _______ in gametes.

• enzymes

• zygotes

• genetic variation

• forty-six chromosomes

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How many pairs of chromosomes do humans have?

• 23

• 14

• It is unknown

• It depends on the human

What does the TT represent in this Punnett square?

• a genotype consisting of two dominant alleles

• a heterozygous trait

• a single allele

• a genotype consisting of two recessive alleles

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What is the name of a genotype that is represented by two capital letters? (for example, TT)

• heterozygous

• homozygous dominant

• homozygous recessive

• phenotype

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