Allele

Multiple Alleles and Polygenic Traits

Module 7 | Lesson 6

Inheritance Can Be Influenced By...

• Multiple Alleles: Genes can have more than two alleles, leading to a variety of phenotypes.

• Polygenic Traits: Traits influenced by multiple genes, resulting in a wide range of phenotypic variations.

• Environmental Factors: External factors can interact with genes, influencing the expression of polygenic traits.

Multiple Alleles:

• Multiple alleles refer to the existence of more than two alleles for a particular gene.

• Each individual can only have two alleles, but there can be multiple alleles in a population.

• This leads to a variety of phenotypes and genotypes.

• Examples include blood types (A, B, AB, O) and coat color in rabbits (black, brown, white).

Multiple Choice

What is the term used to describe the existence of more than two alleles for a particular gene?

• Polygenic traits

• Homozygous alleles

• Multiple alleles

• Dominant alleles

Polygenic Traits

• Polygenic traits are traits that are controlled by multiple genes.
• They exhibit a wide range of phenotypic variation.
• Examples include height, skin color, and intelligence.
• Each gene contributes a small effect to the overall phenotype.
• Environmental factors also play a role in the expression of polygenic traits.

Multiple Choice

What are polygenic traits?

• Traits that are controlled by a single gene

• Traits that are controlled by multiple genes

• Traits that are not influenced by environmental factors

• Traits that exhibit no phenotypic variation

Multiple Choice

Which of the following traits are controlled by multiple genes?

• Eye color

• Hair texture

• Height

• Blood type

Multiple Choice

Which of the following factors can influence the expression of polygenic traits?

• Multiple alleles

• Genetic code

• Environmental factors

• Phenotypic variations

Multiple Choice

Which of the following plays a crucial role in determining various characteristics in organisms?

• Multiple alleles

• Polygenic traits

• Genetic research

• Manipulating traits