"Determining narrow sense heritability depends on knowing the relatedness of individuals in the population."
"Heritability does not say how much of a phenotype is determined by genotype."
"Narrow sense heritability ignores the contribution of variance due to dominant/recessive genetics and variance due to differential expression of genes due to the environment."
"If something is heritable, then it is the ratio of the variation due to genetics over the total phenotypic variance."
These are correct statements about heritability.
Heritability is a concept used in genetics and quantitative genetics to understand the proportion of phenotypic variation in a population that is attributable to genetic differences among individuals. Narrow sense heritability specifically focuses on the additive genetic variance and is determined by evaluating the relatedness of individuals in a population. This measure assesses the contribution of genetic factors to phenotypic variation, excluding the effects of dominance and gene-environment interactions.
Importantly, heritability does not precisely quantify how much of a phenotype is solely determined by genetics. It reflects the extent to which genetic variation contributes to phenotypic variation within a population. On the other hand, broad sense heritability encompasses all genetic sources of variance, including additive, dominance, and gene-environment interactions, making it applicable across diverse populations and environments for the same species.
The statement that "Narrow sense heritability ignores the contribution of variance due to dominant/recessive genetics and variance due to differential expression of genes due to the environment" highlights a limitation of narrow sense heritability, as it simplifies the genetic component to additive effects only.
In the context of heritability, the statement "If something is heritable, then it is the ratio of the variation due to genetics over the total phenotypic variance" underscores the fundamental principle that heritability is a ratio comparing genetic variation to the overall phenotypic variation, providing insights into the relative influence of genetics on a trait within a population.
Complete question:
Choose all the correct statements about heritability.
- Complex traits are the result of multiple genes and influence from the environment.
- Determining narrow sense heritability depends on knowing the relatedness of individuals in the population.
- The mean plus the standard deviation can be used to make predictions about a normal distribution.
- Heritability does not say how much of a phenotype is determined by genotype.
- Broad sense heritability can be applied across multiple populations in different environments, as long as it is for the same species.
- Narrow sense heritability ignores the contribution of variance due to dominant/recessive genetics and variance due to differential expression of genes due to the environment.
- If something is heritable, then it is the ratio of the variation due to genetics over the total phenotypic variance.
- Variance equals standard deviation.