Chapter 5 Flashcards
Discontinuous Variation
phenotypes that fall into two or more distinct, nonoverlapping fashion.
Continuous variation
phenotypic characters that are distributed from one extreme to another in an overlapping fashion.
Polygenic traits
controlled by more than one gene.
Multifactorial traits
Controlled by more than one gene, as well as environmental
influences.
Regression to the mean
averaging out the phenotype, parents with extreme differences
Heritability
amount of inheritance due to genes
Concordance
agreement between traits exhibited by both twins (heritability in twins)
Single Nucleotide Polymorphism (SNP)
Nucleotide site with more than one allele
Is a polymorphism.
Haplotype
Specific combinations of SNPs located close together on a chromosome are likely inherited as a group.
Difference between Discontinuous and continuous variation
Discontinuous is a distinct feature. Continuous is
Different characteristics within a population.
Polygenic traits and multifactorial traits
Multifactorial is also influenced by environment,
while Polygenic is just influenced by the genes.
what heritability tells us about inheritance due to genes
Heritability is the proportion variation in a population trait that can be attributed to inherited genetic factors.
explain how twin studies help understand complex traits.
It allows us to compare similarities between identical twins, who share nearly 100% of their genes, with fraternal twins who share only 50%. Analyzing this helps us with
insights into nature vs. nurture. Like intelligence, personality, and disease susceptibility.
