What is heredity and variation and how does it relate to genetics?
Genes encode the information for making specific proteins, which are responsible for the specific traits of an individual. Each gene can have several variants, called alleles, which code for different variants of the trait in question.
How does heritability and environment work together?
the heritability of a trait may vary, depending on the range of population and environments studied. the interplay that occurs when the effect of one factor (such as environment) depends on another factor (such as heredity).
Heritability can change over time because the variance in genetic values can change, the variation due to environmental factors can change, or the correlation between genes and environment can change.
What is environmental variation?
the ability of an organism to alter greatly its PHENOTYPE depending upon environmental conditions. The phenomenon is seen most clearly in plants, perhaps because they are fixed in the ground.
How genetic variation is created and inherited during reproduction?
During meiosis, homologous chromosomes (1 from each parent) pair along their lengths. The chromosomes cross over at points called chiasma. At each chiasma, the chromosomes break and rejoin, trading some of their genes. This recombination results in genetic variation.
What are inherited genetic variations caused by?
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism’s offspring).
What is genetic variations explain the different factors responsible for genetic variations?
Geographic variation, or the distinctions in the genetic makeup of different populations, often occurs when populations are geographically separated by environmental barriers or when they are under selection pressures from a different environment.
How environmental factors affect the variation and distribution of expressed traits in a population?
Environmental factors can also cause mutations in genes, and viable mutations are inherited. expression of traits, and hence affect the probability of occurrences of traits in a population. Thus the variation and distribution of traits observed depends on both genetic and environmental factors.
How does heritability relate to individuals and groups?
What is heritability, and how does it relate to individuals and groups? Heritability describes the extent to which variation among members of a group can be attributed to genes. Heritable individual differences (in traits such as height or intelligence) need not imply heritable group differences.
How does heritability apply to groups?
Heritability is a group statistic that makes no sense when applied to one person. Heritability is the extent to which differences in the appearance of a trait across several people can be accounted for by differences in their genes.
How do heritability and environment work together quizlet?
How does heritability and environment work together? Our genetic predispositions and our surrounding environments interact. Environments can trigger gene activity, and genetically influenced traits can evoke responses from others.