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Heritability quiz #1

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  • What does the heritability of intelligence refer to?
    The heritability of intelligence refers to the proportion of variation in intelligence within a specific population that is due to genetic differences among individuals. It does not indicate how much of an individual's intelligence is inherited, but rather how much of the observed variation in the population is attributable to genetics.
  • How would you estimate the heritability of metal tolerance in a population of sunstalks?
    To estimate the heritability of metal tolerance in a population of sunstalks, you would calculate the proportion of phenotypic variance in metal tolerance that is due to genetic variance. This can be done using the formula for broad sense heritability (H² = Vg/Vp), where Vg is the genetic variance and Vp is the total phenotypic variance for metal tolerance in the population.
  • What does a heritability value close to zero indicate about the influence of genetics on a trait?
    A heritability value close to zero indicates that environmental factors have a major impact on the trait, and genetic differences contribute very little to the observed variation.
  • How is broad sense heritability (H²) calculated for a trait?
    Broad sense heritability is calculated by dividing the total genetic variance (Vg) by the total phenotypic variance (Vp) for the trait in the population.
  • What is the difference between additive genetic variance and dominance genetic variance?
    Additive genetic variance is caused by differences between alleles, while dominance genetic variance arises when heterozygotes do not show intermediate phenotypes.
  • Why is narrow sense heritability important for artificial selection in breeding programs?
    Narrow sense heritability is important because it predicts how much of a trait can be passed on to offspring through additive genetic effects, helping breeders estimate the success of selection.
  • What alternative formula can breeders use to estimate narrow sense heritability if they lack genetic variance data?
    Breeders can use the formula h² = R/S, where R is the selection response (mean of offspring minus population mean) and S is the selection differential (mean of selected parents minus population mean).
  • How do monozygotic twins help researchers distinguish between genetic and environmental influences on traits?
    Monozygotic twins are genetically identical, so differences in their traits are primarily due to environmental factors, allowing researchers to estimate environmental effects.
  • What is a concordant trait in twin studies?
    A concordant trait is one that is either expressed by both twins or not expressed by either twin, indicating similarity in trait expression.
  • How can copy number variation affect the genetic identity of monozygotic twins?
    Copy number variation can cause monozygotic twins to differ genetically in certain regions, leading to differences in disease susceptibility or trait expression even though they are mostly genetically identical.
  • How can heredity influence a person's energy efficiency, and what does heritability tell us about this trait?
    Heredity can influence a person's energy efficiency by contributing to the genetic variation underlying this trait. Heritability measures the proportion of variation in energy efficiency within a population that is due to genetic differences. A higher heritability value indicates that genetics play a larger role in determining energy efficiency, while a lower value suggests environmental factors are more important. However, heritability applies to population-level variation, not to individuals.