Final answer:
To determine the number of men over 6 feet with blue eyes, both surveying men for their height and eye color as well as analyzing DNA for correlations between these traits are effective methods. Genetics play a crucial role in traits such as eye color and height, and understanding heredity can answer questions about these characteristics in a population.
Step-by-step explanation:
Eye color in humans is determined by multiple genes, and a genetic study to understand the eye color gene would be involved in answering a question about genetic possibilities for certain eye colors. A survey on the height and eye color of individuals would be a more direct method to collect data specifically about men over 6 feet with blue eyes. However, analyzing DNA could offer insights into the potential genetic correlation between height and eye color.
For example, if both parents have brown eyes but produce a green-eyed child, it is genetically possible if both parents are heterozygous, carrying the gene for green eyes (b). Phenotypic traits such as height and red-green colorblindness can be influenced by genetic and environmental factors. Red-green colorblindness is a sex-linked trait, predominantly affecting males, as they have a single X chromosome. A Punnett square showing a cross between a homozygous recessive dwarf pea plant and a heterozygous tall pea plant would result in a phenotypic ratio of 2 tall to 1 dwarf (c). This showcases the principles of genetics, dominance, and recessive traits, which are fundamental to understanding heredity and genetic variation in populations.