D3.2 Inheritance HL Flashcards
What is independent assortment?
The random segregation of gene alleles during gamete formation
Define a dihybrid cross
A genetic cross involving two unlinked genes
What is Mendel’s second law?
Law of Independent Assortment
What is the expected phenotypic ratio in a dihybrid cross of unlinked genes?
9:3:3:1
What are Punnett grids used for?
To predict outcomes of genetic crosses
Why don’t linked genes assort independently?
Because they are located close together on the same chromosome
What is crossing over?
The exchange of genetic material between non-sister chromatids during meiosis
What is a chi-squared test used for in genetics?
To determine the statistical significance of observed vs. expected data in genetic crosses
What is a genetic locus?
The specific location of a gene on a chromosome.
Give an example of a genetic disease tested through genetic counseling.
Huntington’s disease
