Understanding Homozygous and Heterozygous Traits

This video tutorial from Mumu Math and Science explains the difference between homozygous and heterozygous traits, essential for understanding Punnett squares. It covers how to identify these traits using examples, discusses dominant and recessive traits, and provides practice worksheets. The video also delves into advanced genotype and phenotype analysis, showing how to determine phenotypes from genotypes and vice versa. It concludes with practical exercises to reinforce the concepts.

What does homozygous mean?

• A trait made up of two different alleles

• A trait that is always recessive

• A trait made up of two of the same alleles

• A trait made up of one dominant and one recessive allele

How would you write a heterozygous trait using the letter T?

• TT

• tt

• Tt

• tT

Which of the following is a homozygous trait?

• Bb

• BB

• bB

• Bb

If a trait is heterozygous and has a capital letter, what will be its phenotype?

• Intermediate

• Recessive

• Unknown

• Dominant

What is the phenotype of a homozygous recessive genotype for body color if blue is recessive?

• Green

• Yellow

• Blue

• Red

What does the term 'phenotype' refer to?

• The genetic makeup of an organism

• The physical expression of a trait

• The dominant trait

• The combination of alleles

How would you write the genotype for a dominant trait if it is homozygous?

• Two lowercase letters

• One uppercase letter

• One uppercase and one lowercase letter

• Two uppercase letters

What is the genotype for a recessive trait if it is homozygous?

• Two uppercase letters

• One lowercase letter

• Two lowercase letters

• One uppercase and one lowercase letter

If a trait is dominant and heterozygous, how can it be written?

• One uppercase and one lowercase letter

• One uppercase letter

• Two lowercase letters

• Two uppercase letters

What is the genotype for a dominant trait if it is heterozygous?

• Two uppercase letters

• One uppercase and one lowercase letter

• Two lowercase letters

• One lowercase letter