AP Genetics and Heredity

One of the main reasons genes assort independent of one another  is that 

• they produce unrelated traits
• they produce related traits
• they are on the same chromosome
• they are on different chromosomes.

If 2n = 48 for a particular cell, then the chromosome number in each cell after meiosis would be

• 96

• 48

• 24

• 12

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The process depicted in the image above is best summarized by which of the following descriptions?

• During the synthesis phase of the cell cycle, DNA molecules replicate to generate identical daughter cells

• Centromeres align specific gene sequences of homologous chromosomes during mitotic divisions.

• The spindle apparatus attaches at chiasma during metaphase of mitosis.

• During meiosis, crossing over leads to recombination of alleles between homologous chromosomes

If black and white true-breeding mice are mated and the result is all gray offspring, what inheritance pattern would this be indicative of?

• dominance
• codominance
• multiple alleles
• incomplete dominance

The range of human skin colors is caused by a variety of genes, each of which has at least 2 alleles.  This is an example of:

• incomplete dominance
• codominance
• multiple alleles
• polygenic inheritance

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An organism that inherits two of the same alleles from its parents

• dominant

• phenotype

• heterozygous

• homozygous

Imagine you are performing a cross involving seed color in garden pea plants. What F₁ offspring would you expect if you cross true-breeding parents with green seeds and yellow seeds? Yellow seed color is dominant over green.

• 100 percent yellow-green seeds
• 100 percent yellow seeds
• 50 percent yellow, 50 percent green seeds
• 25 percent green, 75 percent yellow seeds

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In humans, if a non-disjunction event leads to an individual that is XXY, they would

• be female because they have 2 X chromosomes
• be male because they have a Y chromosome
• not survive
• have both male and female characteristics

If a particular pedigree follows a sex-linked recessive trait, you would expect to see

• more affected females

• all carrier males

• more affected males

• an equal number of affected males and females

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Does this pedigree show a autosomal dominant or autosoomal recessive trait?

• Dominant

• Recessive

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