7.1 Inheritance Flashcards
What are the 5 different types of inheritance?
codominant
multiple alleles
sex-linkage
autosomal linkage
epistasis
What is a genotype?
the genetic constitition of an organism = the alleles it has for 1 gene
What is a phenotype?
the expression of genes and its interaction with the environment
What does homozygous mean?
a pair of homologous chromosones carrying the same alleles for a single gene
What does heterozygous mean?
a pair of homologous chromosome carrying two different alleles for a single gene
What is codominant inheritance?
both alleles are equally dominant and expressed in the phenotype
What does multiple alleles mean?
more than 2 alleles for a single gene
What does sex-linkage mean?
a gene whose locus is on the X chromosome
What does autosomal linkage mean?
genes that are located on the same non-sex chromosome
What is epistasis?
when 1 gene modifies or masks the expression of a different gene at a different locus
What is monohybrid inheritance?
cross of characteristics determined by 1 gene
What is dihybrid inheritance?
cross of characteristics determined by 2 genes
What is chi-squared?
statistial comparison between observed and expected results
How can you tell something was by chance due to deviation from the expected (chi-squared)?
deviation from what was expected is small
How can you tell something was by bias due to deviation from the expected (chi-squared)?
deviation from what was expected is large
What is the chi-squared equation?
sum of (O-E)^2 / E
E = expected value
O = observed value