For several phenotypes in the human population, it is clear that more than just the genotype is influencing the expression of the trait
Analysis of human populations indicates that height and weight are examples of phenotypes under environmental influence as well as genotype. Provide evidence that would support the contention that both environment and genotype influence human weight.
Several investigators have collected data on the average heights and weights of different human populations over many years. What is clear is that certain populations are showing increases in both phenotypes, and these changes have occurred so quickly that they cannot be due to something like gene mutation. Rather, environmental influences such as diet have a profound impact on these changes. The types of foods that we eat today versus just 20 years ago and changes in food production and processing can potentially influence the phenotypes of height and weight.
You might also like to view...
The sequence and actions of genes controlling development of the anterior-posterior axis of Drosophila illustrate (Select all correct choices):
A. hierarchical control of gene regulation during development. B. maternal developmental effect. C. that genes controlling development are turned on in groups, with each group acting to refine and narrow the pattern of differentiation generated by previous groups. D. that genes controlling development are turned on in sequence, with each set acting on a different set of cells to specify the cells' ultimate fates.
In instances in the eukaryotic genome, DNA sequences represent evolutionary vestiges of duplicated copies of genes. What are such regions called and what are their characteristics?
What will be an ideal response?
Ossification
What will be an ideal response?
Which structure in the cell shown in Figure 7-3 above modifies, sorts, and packages proteins and other materials for storage or release from the cell?
A. Structure A B. Structure B C. Structure C D. Structure D