17.6 - Autosomal Linkage Flashcards
How autosomal linkage affects inheritance patterns An example of autosomal linkage in fruit flies How crossing over can affect linked genes
What are autosomes?
Chromosomes that don’t determine sex
What are linked genes?
Genes located on the same autosome
What is the effect of linked genes on inheritance?
Tend to be inherited together
What is the effect of linked genes on phenotypic ratios?
Different from expected ratios from independent assortment
What happens to parental allele combinations with linked genes?
Preserved across generations
What is crossing over?
Exchange of genetic material between homologous chromosomes
What are chiasmata?
Regions where crossing over occurs
What are recombinant offspring?
Offspring with different allele combinations from parents
How does crossing over affect autosomal linkage?
Can separate linked genes
What is the probability of linked genes being separated?
Inversely proportional to distance between them
What are the alleles for body color and wing length in fruit flies?
B (brown)
What happens in a fruit fly cross with linked genes?
Mainly parental phenotypes in offspring
