Polygenic Traits and Blood Types

The video tutorial explains the difference between polygenic traits and multiple alleles. Multiple alleles involve more than two versions of a gene, such as in blood types A, B, AB, and O. Polygenic traits involve multiple genes contributing to a single phenotype, like skin color. The tutorial uses examples to clarify these genetic concepts.

What is the main difference between polygenic traits and multiple alleles?

• Polygenic traits involve multiple genes, while multiple alleles involve variations of a single gene.

• Polygenic traits involve a single gene, while multiple alleles involve multiple genes.

• Polygenic traits and multiple alleles are the same.

• Polygenic traits involve only dominant alleles.

Which of the following is an example of a trait with multiple alleles?

• Height

• Blood type

• Eye color

• Hair texture

In the context of blood types, what does it mean for A and B to be co-dominant?

• B is dominant over A.

• A is dominant over B.

• A and B are both expressed equally when present.

• A and B cannot be expressed together.

What genotype represents type O blood?

• IAIA

• ii

• IAIB

• IBIB

How many genes typically contribute to a polygenic trait?

• Several

• Two

• One

• None

What is a classic example of a polygenic trait?

• Hair color

• Eye color

• Skin color

• Blood type

How do polygenic traits differ from the central dogma of biology?

• They do not involve proteins at all.

• They involve multiple proteins forming one gene.

• They involve multiple genes contributing to one phenotype.

• They involve a single gene coding for multiple proteins.

Which of the following is NOT a characteristic of polygenic traits?

• Examples include skin color and height

• Involves multiple genes

• Results in a wide range of phenotypes

• Involves a single gene with multiple alleles

What does the term 'polygenic' mean?

• Dominant gene

• Single gene

• Many genes

• No genes

Why is skin color considered a polygenic trait?

• It is determined by a single gene.

• It is not influenced by genetics.

• It is influenced by environmental factors only.

• It is controlled by multiple genes, leading to a variety of shades.