Dihybrid Cross Practice Flashcards
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Questions and Answers

What is the phenotypic ratio for Aa x Aa (two heterozygous)?

3:1

What is the genotypic ratio for Aa x Aa (two heterozygous)?

1:2:1

What is the phenotypic and genotypic ratio for Aa x aa (1 heterozygous and 1 homozygous)?

1:1

What is the phenotypic ratio for AaBb x AaBb (two pairs of heterozygous cross)?

<p>9:3:3:1</p> Signup and view all the answers

What is the phenotypic and genotypic ratio for AaBb x aabb (1 pair heterozygous and 1 homozygous)?

<p>1:1:1:1</p> Signup and view all the answers

How can you identify a dominant trait from a pedigree chart?

<p>Every affected individual has at least one affected parent</p> Signup and view all the answers

Study Notes

Dihybrid Cross Ratios

  • Phenotypic ratio for a cross between two heterozygous individuals (Aa x Aa) is 3:1, indicating three dominant expressions to one recessive.
  • Genotypic ratio for the same cross (Aa x Aa) is 1:2:1, showing one homozygous dominant, two heterozygous, and one homozygous recessive genotype.

Monohybrid Cross Ratios

  • When crossing a heterozygous individual (Aa) with a homozygous recessive individual (aa), both the phenotypic and genotypic ratio result in 1:1, indicating equal chances of dominant and recessive traits appearing.

Dihybrid Cross Ratios with Two Traits

  • In a dihybrid cross between two individuals heterozygous for both traits (AaBb x AaBb), the phenotypic ratio is 9:3:3:1. This reflects the combinations of traits for two independent genes.
  • When crossing one individual heterozygous for both traits (AaBb) with one homozygous recessive individual (aabb), the resulting phenotypic and genotypic ratio is 1:1:1:1, indicating equal distribution of the four possible genotype combinations.

Identification of Dominant Traits in Pedigrees

  • In pedigree charts, a dominant trait can be identified by observing that every affected individual has at least one affected parent.
  • The trait tends to appear in every generation once it is present, suggesting a direct inheritance pattern.

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Description

Test your knowledge of phenotypic and genotypic ratios with these flashcards on dihybrid crosses. Each card presents scenarios using various genetic combinations, allowing for a comprehensive review. Perfect for students studying genetics and Mendelian inheritance.

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