Analyzing Pedigrees: Identifying Dominant and Recessive Traits

The video tutorial explains how to identify whether a trait in a pedigree is dominant or recessive. Dominant traits are characterized by affected offspring having at least one affected parent and not skipping generations. Recessive traits can appear in offspring from unaffected parents and may skip generations. The video also discusses how mating between related individuals can lead to the sudden appearance of recessive traits.

What is a key feature of a dominant trait in a pedigree?

• It is only transmitted by females.

• It always has an affected parent.

• It appears only in males.

• It skips generations.

How can you tell if a trait is dominant in a pedigree?

• It is only found in the first generation.

• It appears in every generation.

• It is transmitted from unaffected parents.

• It only affects males.

What is a characteristic of a dominant trait in terms of generation appearance?

• It is only found in females.

• It only appears in the first generation.

• It appears in every generation.

• It skips every other generation.

What indicates a recessive trait in a pedigree?

• Affected offspring always have affected parents.

• Unaffected parents can have affected offspring.

• It appears in every generation.

• It is only found in males.

In a recessive trait, what is the genetic makeup of unaffected parents?

• Homozygous dominant

• Homozygous recessive

• Heterozygous

• None of the above

What is a common pattern of recessive traits in pedigrees?

• They are only found in males.

• They skip generations.

• They appear in every generation.

• They are only transmitted by females.

How can you identify a recessive trait in a pedigree?

• It appears in every generation.

• It skips generations and can appear suddenly.

• It is transmitted from affected parents only.

• It is only found in males.

What happens when related individuals with a recessive trait mate?

• The trait is only transmitted by females.

• The trait disappears.

• The trait appears suddenly.

• The trait is only found in males.

Why might a recessive trait suddenly appear in a family?

• It is only found in the first generation.

• Because of mating between related individuals.

• It is only transmitted by males.

• Due to a new mutation.

What is a sign of a recessive trait in a pedigree involving related individuals?

• The trait is only found in the first generation.

• The trait appears suddenly.

• The trait is only transmitted by females.

• The trait is only found in males.