Gene Interactions Flashcards
What law is broken when genes are physically near each other, i.e. linked?
Mendel’s second law, independent assortment.
In linked genes, do we expect more parental or recombinant types?
More parental types.
The less recombinants in a testcross, the _______ the genes are.
…closer together…
What is the maximum recombination in a testcross?
50% - this hits the expected 1:1:1:1 ratio.
What is it called when two alleles contribute to a phenotype?
Incomplete dominance.
What is it called when heterozygotes express both phenotypes?
Codominance.
When a single gene affects multiple traits, we have…
Pleiotropy.
When a single gene affects multiple traits, we have…
Pleiotropy.
Epistasis is when…
The expression of a locus depends on the expression of another locus.
What do we call quantitative traits, influenced by many genes?
Polygenic traits.
The combination of polygenic trait and the environment gives us:
Complex characters.
A haploid genotype, a group of alleles inherited from one parent, is called:
A haplotype.
What are the three different maps to look at gene interactions?
- Chromosomal maps
- Linkage maps
- Physical maps
What genetic map has been greatly aided by the genomics revolution?
The physical map, i.e. the actual genetic sequence.
What genetic complication would lead to a 2:1 ratio in offspring, where the 4th offspring can’t even develop?
Recessive lethal alleles.
