In the figure depicting heritability of migratory timing in the blackcap warbler, what does the straight line indicate?
A) the broad-sense heritability
B) the narrow-sense heritability
C) the norm of reaction of nocturnal restlessness
D) the response to selection

Question

In the figure depicting heritability of migratory timing in the blackcap warbler, what does the straight line indicate? 
A) the broad-sense heritability 
B) the narrow-sense heritability 
C) the norm of reaction of nocturnal restlessness 
D) the response to selection

Quizplus · Accepted Answer

The straight line in the figure represents the narrow-sense heritability, which is the proportion of phenotypic variance that is due to additive genetic variance. This means that genetic factors play a significant role in determining migratory timing in blackcap warblers. The broad-sense heritability includes all sources of genetic variation, including dominant and epistatic effects, which are not accounted for in the narrow-sense heritability. The norm of reaction of nocturnal restlessness refers to the range of phenotypic expressions of a particular genotype in different environments, which is not shown in this figure. The response to selection is the change in average trait value over time due to differential survival or reproduction of individuals with certain traits, which is not directly indicated by this figure.

In the Figure Depicting Heritability of Migratory Timing in the Blackcap