Genetics Concepts and Inheritance Patterns

The video revisits Mendelian genetics, exploring genotypes, phenotypes, and alleles. It delves into dominance, incomplete dominance, and codominance, using examples like snapdragons and cows. The concept of multiple alleles is discussed with human blood types as an example. Pleiotropy and epistasis are introduced, highlighting their roles in genetic expression. The video also covers polygenic inheritance and environmental influences on phenotypes, emphasizing the complexity of genetic inheritance beyond Mendel's initial findings.

What is the result of hybridizing true-breeding red and white snapdragons?

• A generation of red and white snapdragons

• A generation of pink snapdragons

• A generation of white snapdragons

• A generation of red snapdragons

In codominance, how are phenotypes expressed?

• Only the dominant phenotype is expressed

• Only the recessive phenotype is expressed

• Both phenotypes are expressed simultaneously

• Neither phenotype is expressed

What does the dominant allele code for in Mendel's seed shape experiment?

• A defective enzyme

• A wrinkled seed enzyme

• A water-absorbing enzyme

• A branched starch enzyme

Which blood type results from the expression of IA and IB alleles?

• Type B

• Type A

• Type AB

• Type O

What is pleiotropy?

• A single gene affecting multiple traits

• Multiple genes affecting a single trait

• A gene that is always recessive

• A gene that is always dominant

In Labrador retrievers, what determines if pigment is deposited onto the fur?

• The presence of a dominant pigment allele

• The presence of a recessive pigment allele

• The presence of a pigment deposition gene

• The absence of any pigment gene

What is polygenic inheritance?

• A trait determined by a single gene

• A single gene affecting multiple traits

• Multiple genes affecting a single trait

• A trait influenced by environmental factors

Which of the following is an example of a multifactorial trait?

• Blood type

• Seed shape in peas

• Skin color

• Flower color in snapdragons

What does the term 'multifactorial' refer to in genetics?

• Traits influenced by multiple genes and environmental factors

• Traits influenced by a single gene

• Traits that are always recessive

• Traits that are always dominant

What concept explains the influence of both genetic and environmental factors on a phenotype?

• Pleiotropy

• Epistasis

• Polygenic inheritance

• Multifactorial traits