Question

Components of heritability include:

1. both genetic and environmental variances without interference between them

2. only genetic variance

3. only environmental variance

4. both genetic and environmental variances with interference between them

Answer 1

Answer::

Option (4)

Explanation:

Heritability is a concept that describe how much of total phenotypic variation in a population is due to variation in genetic factors.As we know, phenotype that vary between the individuals in a population is caused by both environmental factors and genetic factor ,as well as various interaction between genes and the environmental factors.So, we can say that a high heritability indicate that much of phenotypic variation can be due to genetic factor as compare to environmental factors whereas,in low heritability environmental factors are likely to have greater impact on the phenotypic variation as compare to genetic factor.

Heritability may be measured by two type broad sense and narrow sense heritability.

Broadsense heritability ( H^{​​​​​​2}) reflects all the possible phenotypic variance due to genotype::

H2- all Va ( genotypic variance) up (phenotypic variance Vp the phenotypic variance is due to sum three component such as environmental variance (VE), Jeno typie variance ( VG) and variance resulting from the interaction both Enviroment and genotype (VGE) Vp = Vet VG+ VGE vq variance can be oneasured as additive, dominant and epistatic variance. VG = VAT V T VI The Nassow sense heritability (142) includes only proportion of genetic etic variance he is die to additive genotypic variance (VA) th2= VA VP
So, heritability component are both environmental and genetic variance ....