Exploring Non-Mendelian Inheritance: Incomplete Dominance and Codominance

The video explores non-Mendelian genetic traits, focusing on incomplete dominance, codominance, polygenic traits, and epistasis. It uses examples like snapdragons, chickens, human height, and llamas to illustrate these concepts. The video emphasizes that non-Mendelian traits do not follow traditional dominant-recessive patterns and highlights the importance of understanding these genetic variations.

What is the term used when a dominant allele does not fully express over a recessive allele, resulting in a blend of traits?

• Epistasis

• Polygenic inheritance

• Incomplete dominance

• Codominance

What color are the offspring of a red snapdragon and a white snapdragon?

• Pink

• Speckled

• Red

• White

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

In codominance, what is the phenotype of offspring from a black chicken and a white chicken?

• Black

• Black and White

• White

• Grey

Tags

NGSS.HS-LS3-1

How are different letters used in genetic representation?

• To indicate dominant and recessive alleles

• To differentiate between incomplete dominance and codominance

• To mark epistatic interactions

• To show polygenic inheritance

What does a Punnett square illustrate?

• The environmental impact on genetics

• The exact phenotype of offspring

• The possible genotypes of offspring

• The number of chromosomes in a cell

Which of the following traits is an example of polygenic inheritance?

• Snapdragon color

• Chicken color

• Human height

• Llama wool color

Tags

NGSS.HS-LS3-3

What environmental factor can influence human height?

• Humidity

• Temperature

• Nutrition

• Altitude

What is epistasis?

• One gene's expression depending on another gene

• Two alleles blending to form a new phenotype

• Multiple genes influencing a single trait

• A single gene controlling multiple traits

What happens to a llama's wool color if it inherits the cc genotype for the epistatic gene?

• It becomes brown

• No pigment is expressed

• It becomes speckled

• It becomes black

Tags

NGSS.HS-LS3-1

Why is it important not to assume non-Mendelian inheritance in problem-solving?

• To avoid confusion with polygenic traits

• Because Mendelian inheritance is more common

• Unless specific information indicates otherwise

• Because non-Mendelian traits are rare