Genetics and Inheritance Concepts

The video tutorial explores various patterns of inheritance beyond simple dominant and recessive alleles. It covers incomplete dominance using four o'clock plants, codominance with chicken feather color, and multiple alleles with human blood types. The tutorial also discusses polygenic traits and how environmental factors can influence gene expression, using examples like butterflies and rabbits.

What happens when a dominant allele is present in an organism?

• The dominant trait is expressed.

• The dominant trait is masked.

• The recessive trait is expressed.

• Both traits are blended.

In four o'clock plants, what color flowers do heterozygous plants produce?

• Blue

• Pink

• White

• Red

How does codominance differ from incomplete dominance?

• Codominance blends traits, incomplete dominance does not.

• Incomplete dominance blends traits, codominance expresses both traits distinctly.

• Both express traits distinctly.

• Both blend traits.

Which blood type alleles are codominant?

• O and AB

• A and B

• B and O

• A and O

What is an example of a polygenic trait?

• Blood type

• Flower color in four o'clock plants

• Eye color in humans

• Feather color in chickens

How do multiple alleles differ from polygenic traits?

• Both involve multiple genes.

• Multiple alleles involve one gene, polygenic traits involve multiple genes.

• Polygenic traits involve one gene, multiple alleles involve multiple genes.

• Both involve one gene.

What environmental factor affects the wing coloration of western white butterflies?

• Temperature

• Humidity

• Day length

• Altitude

Why might darker pigmentation be beneficial for butterflies in spring?

• To reflect sunlight

• To absorb more heat

• To camouflage with flowers

• To attract mates

What internal factor can influence the expression of male pattern baldness?

• Male hormones

• Sunlight

• Diet

• Exercise

What is the role of the environment in gene expression?

• It only affects plant genes.

• It can influence how genes are expressed.

• It solely determines traits.

• It has no role.