Dominant and Recessive

Genotypes: Dominant and Recessive Alleles

Genotype Structure

• Genotype: A two letter code that represents the passing of genes from parent to offspring.

• Allele: An allele is represented by each of the letters. There are two alleles per Genotype.

How Genotypes are written

• Genotypes are written just like you write your name: The capital letter(s) always come first.

• There are three different kinds of Genotypes: Homozygous dominant, homozygous recessive, and heterozygous.

• When writing a genotype, you use the same letter for each allele (the difference lies within whether it is dominant or recessive).

• Example: AA, aa, and Aa

Multiple Choice

Which of the following best represents a Genotype?

• Aa

• aA

• Ab

Multiple Choice

What does the term homozygous mean?

• The same allele variation is present.

• Different allele variations are present.

Multiple Choice

Which of the following is Homozygous dominant?

• aa

• Aa

• AA

Multiple Choice

Which of the following is Homozygous recessive?

• Aa

• aa

• AA

Multiple Choice

Which of the following best represents describes heterozygous?

• Same allele variation present.

• Different allele variation present.

Multiple Choice

Which of the following represents a Heterozygous genotype?

• AA

• Aa

• aa

Multiple Choice

What kind of Genotype is this: BB

• Homozygous dominant

• Homozygous recessive

• Heterozygous

Multiple Choice

What kind of genotype is this: gg

• Homozygous dominant

• Homozygous recessive

• Heterozygous

Multiple Choice

What kind of genotype is this: Hh

• Homozygous dominant

• Homozygous recessive

• Heterozygous