Answer:
Heritability is important in agriculture because, in selective breeding heritability plays a major role. The breeder selects the plants as breeding stock for next generation, whose heritability value is high to improve the desired traits.
People misunderstood the concept of heritability, by thinking that the variation of a trait is governs by genetics alone. But, Heritability is the amount of phenotypic variation is due to genetic variation in a particular population raised in a particular environment. Heritability depends on both genetical and environmental factors. Heritability does not describe the relative impact of the genetic variation and effect of environment on the outcome of a trait.
Answer:
We know that, the r value ranges between -1 and +1. Here, r = 0.5 and N = 4, that indicates that there may be a weak positive correlation between the two variables by chance. There is a need to conduct more experimentation by taking many more pairs of individuals in to account to determine the r value is whether statistically significant or it occurred as a matter of random sampling errors.
In case N = 500, then the correlation would be statistically significant and the correlation may not occurred by chance.
Answer:
We know that the phenotypic expression of a trait within a population is due to the genetic variation in the population. It is called heritability of the trait. In the given situation, the first strain with seven QTLs has at least 7 different genes in the form of multiple alleles that are influencing the phenotype of the trait (head weight in cabbage). The second strain with 4 QTLs also has the same type of 7 genes. But out of these 7 genes, 3 genes became monomorphic. So, these 3 genes do not have any influence on the head weight of cabbage. It is a common effect of inbreeding.