Genetics Flashcards
What is the law of segregation?
Two copies of a single gene separate from one another in meiosis
What did Mendel find in his work?
Aw of segregation
Law of independent assortment
Dominate and recessive nature of genes
What is a test cross?
Parent crossed with homozygous recessive to determine genotype
What are some examples of exceptions to Mendelian genetics
Traits don’t usually result from 1 gene
Don’t usually encode one gene one trait
Some genes don’t follow inheritance patterns
Describe incomplete dominance
Intermediate phenotype( snapdragons)
Explain co dominance
More than one version of the gene( blood type)
What are multigenic traits?
Multiple genes contributing to a trait
What
What are pleiotropic traits
One gene affects more than one phenotype
Cystic fibrosis
What is epistasis
A mutation in a gene at the end of the pathway can over ride the phenotype
Why don’t genes always randomly assorted?
Genes are located on chromosomes which restricts their ability to randomly assort
Do sex chromosomes have the same inheritance patterns at autosomes?
No
Does the Y chromosome have a homologue?
No. Meaning that it dosent have a chance to recombine in meiosis and is very stable
Allows you to track paternal ancestors
How do you map maternal ancestry?
Through the mitochondrial DNA which is only inherited through the mon
