Inheritance Pattern ID 1
Crossing a red flower (RR) with a white flower (WW) produces pink offspring. This type of inheritance explains the blending.
Incomplete dominance?
What are the two kinds of epistasis?
Dominant and recessive
What blood types will produce an O blood type?
ii
What is a real life example of epistasis?
Labradors or squash
What are the genes called that have a large, easily observable effect on a particular trait?
Major genes
Crossing a white cow (WW) with a red cow (RR) produces offspring with red and white patches showing both colors fully. This inheritance pattern is called:
Codominance.
What genotype will provide both dominant and recessive phenotypes, or a blend of dominant and recessive phenotypes, depending on the inheritance pattern?
Heterozygous
A person with blood type A can have these two genotypes.
IAi and IAIA
What is the typical distribution of a polygenic trait in a population?
Bell curve (normal distribution)
When every individual with a particular genotype shows the expected phenotype, this type of penetrance is present.
Complete penetrance
Skin color in humans is controlled by many genes. This type of inheritance is called:
Polygenic
When one gene masks the expression of another gene, it is called:
Epistasis
Is it possible for a A father and an O mother to have an O child? Explain.
Yes, if the father is heterozygous (IAi)
A trait that falls into discrete categories (e.g., blood type) rather than a continuum is called:
Discontinuous trait
A gene that influences the effect of another gene is called this.
Modifier gene
When one gene affects multiple phenotypic traits, it is called this:
Pleiotropy
A trait like height is influenced by both genetics and environment. This type of trait is called:
Multifactorial trait
A mother with type A blood (IAi) and a father with type B blood (IBi) can have a child with these possible blood types.
A, B, AB, or O
The gene being masked in an epistatic interaction is called the:
Hypostatic gene
When individuals with a particular genotype all show the same exact phenotype, this term is used:
Unvarying expressivity
Provide one example of pleiotropy in real life.
The Maori people of New Zealand: many men develop respiratory issues and are also sterile because of the presence of a single gene.
Traits like height or skin color that show a continuous range of variation are called:
Polygenic traits
What blood type proves that blood types are an example of codominance?
In ABO blood group system, both IA and IB alleles are expressed equally in individuals with AB blood type.
How is it that Gregor Mendel’s Law of Segregation is still true even during incomplete dominance?
Each allele still separates during gamete formation; the heterozygous individuals just express a blended phenotype, but the alleles themselves do not blend and can reappear in later generations. The genotypes simply code for different proteins that produce different phenotypes.
When the same genotype causes a range of phenotypes in different individuals, this term is used:
Variable expressivity