203 Questions

Genetics

Practice Genetics MCQs from Biology — Science.

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What is the phenotypic ratio of a dihybrid cross in the F2 generation?

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If a red-flowered plant is crossed with a white-flowered plant and the offspring are all pink, this is an example of:

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A cross used to determine whether an organism expressing a dominant trait is homozygous or heterozygous is called a:

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Which of the following is an example of a sex-linked recessive disorder?

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How many hydrogen bonds form between Guanine (G) and Cytosine (C) in DNA?

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What components make up a single nucleotide of DNA?

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Which of the following is a reason why Mendel chose pea plants for his experiments?

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What is the genotype of a carrier female for color blindness?

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In a cross between $Tt$ and $Tt$, what is the probability of obtaining a dwarf plant ($tt$)?

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Which nitrogenous bases are purines?

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Variation that is sudden, random, and heritable is called:

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The sex of a child is determined by which parent?

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What is the result of a cross between a homozygous tall plant and a heterozygous tall plant?

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A sudden change in the structure of a chromosome or gene is called:

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Which of the following describes the genotype $Tt$?

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The point where two sister chromatids are joined together is the:

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In a human karyotype, how many pairs of autosomes are there?

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What would be the phenotypic ratio in the F1 generation of a cross between $TT$ and $tt$?

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If a man with color blindness marries a woman with normal vision (non-carrier), what is the chance their son will be color blind?

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How many total alleles for a single gene does an individual typically have in their somatic cells?

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