Genotype/Phenotype

Genotype/Phenotype

Genotype Vs. Phenotype

• Organisms (plant and animals) inherit traits from their parents. They get one allele (piece of DNA) from each parent that combine to form an organisms DNA

• GENOTYPE: The combination of genes an organism receives from it's parents

• PHENOTYPE: How an organism looks (PHYSICAL)

Multiple Choice

Which of the following correctly describes GENOTYPE?

• A. The combination of genes an organism has

• B. The physical traits an organism demonstrates

Multiple Choice

Which of the following correctly describes PHENOTYPE?

• A. The combination of genes an organism has

• B. The physical traits an organism demonstrates

Think about it!

What are some PHENOTYPES we can see on these cats?

What are some phenotypes that human children have?

What phenotype can you see in the plants?

Genotype

• Alleles (one from mom and one from dad) can be represented by big (A) or small (a) letters.

• Organisms can have HOMOZYGOUS alleles (the same)

• Or HETEROZYGOUS alleles (different)

• Homozygous: AA, aa

• Heterozygous: Aa

Multiple Choice

Which of the following is true about alleles?

• A. Everyone only gets one allele.

• B. Everyone gets two alleles.

• C. Everyone gets three alleles.

Multiple Choice

Where do an organism's alleles come from?

• A. One from mom, and one from dad

• B. Both from mom

• C. Both from dad

Multiple Choice

Which of the following means an organism has two of the SAME alleles?

• A. Homozygous

• B. Heterozygous

Multiple Choice

What does HETEROZYGOUS mean?

• Two of the SAME allele

• Two DIFFERENT alleles

Multiple Choice

Which of the following describes the Genotype AA?

• A. Homozygous

• B. Heterozygous

Multiple Choice

Which of the following describes the Genotype aa?

• A. Homozygous

• B. Heterozygous

Multiple Choice

Which of the following describes the Genotype Aa?

• A. Homozygous

• B. Heterozygous

Multiple Choice

Which of the following genotypes is HETEROZYGOUS

• A. TT

• B. Tt

• C. tt

Dominant vs. Recessive

• Alleles can be DOMINANT (Big Letter) or RECESSIVE (small letter)

• If a GENOTYPE contains a dominant allele (big letter) it will show the dominant trait.

• An organism can only express a recessive trait if it has two recessive alleles

Multiple Choice

The allele "H" represents a __________ allele.

• Dominant

• Recessive

Multiple Choice

True or False: The genotype "gg" contains a dominant allele

• True

• False

Example:

• Purple Flowers are Dominant

• White Flowers are Recessive

• PP = Purple

• Pp = Purple

• pp = White

Multiple Choice

Brown eyes are dominant. Blue eyes are recessive. Any genotype with a Big B are represent a person with _____ eyes.

• Blue

• Brown

Multiple Choice

Brown eyes are dominant. Blue eyes are recessive. What is the phenotype for the genotype BB?

• Blue

• Brown

Multiple Choice

Brown eyes are dominant. Blue eyes are recessive. What is the phenotype for the genotype Bb?

• Blue

• Brown

Multiple Choice

Brown eyes are dominant. Blue eyes are recessive. What is the phenotype for the genotype bb?

• Blue

• Brown

Multiple Choice

In cats, a long tail is dominant and a bob-tail is recessive. Which of the following genotypes would have bobtail?

• A. Tt

• B. TT

• C. tt

Multiple Choice

In cats, a long tail is dominant and a bob-tail is recessive. Do more cats have long tails or bob-tails?

• More have long tails

• More have bob-tails

Multiple Choice

Straight hair is dominant, and curly hair is recessive. Which allele represents curly hair?

• H

• h

Multiple Select

Straight hair is dominant, and curly hair is recessive. Which of the following Genotypes result in straight hair?

• A. hh

• B. Hh

• C. HH

Multiple Choice

Which of the following do you believe to be the DOMINANT trait of the horses below?

• Dark Brown

• Light Brown