Through advanced genetic screening, Todd was informed that he had the genetic potential to grow to 6'5. However, at age 35, Todd stands at about 5'10. Taking into account gene/environment interactions, how is this scenario best explained?

Question

Through advanced genetic screening, Todd was informed that he had the genetic potential to grow to 6'5. However, at age 35, Todd stands at about 5'10. Taking into account gene/environment interactions, how is this scenario best explained?

BlackTom AI · Accepted Answer

A genotype defines a reaction range of possible phenotypes; environmental conditions determine where within that range an individual’s outcome will fall. Height is a classic example of gene × environment interaction: genes set a potential (or upper/lower bounds), while nutrition, chronic illness, endocrine function, and overall health during childhood and adolescence determine the realized adult height.

Step-by-step reasoning:
1. The genetic screening indicates Todd’s genetic potential for height is 6'5". Convert units to see the magnitude: 6'5" = (6 × 12) + 5 = 72 + 5 = 77 inches (≈195.6 cm). Todd’s current height, 5'10", is (5 × 12) + 10 = 60 + 10 = 70 inches (≈177.8 cm). The shortfall is 77 − 70 = 7 inches (≈17.8 cm).
2. Because his genotype reportedly allows up to 6'5", his genes do not preclude reaching that height; the difference must therefore be due to environmental constraints experienced during growth (poor nutrition, prolonged illness, hormonal problems, chronic stress, or other adverse conditions).
3. This pattern matches the concept of phenotypic plasticity/reaction range: an individual with genetic potential for tall stature can still be shorter if developmental environment is suboptimal.

Why B is correct:
- Option B explicitly states that a less-than-ideal developmental environment prevented Todd from reaching his genetic potential, which explains the observed 7-inch deficit.

Why the other options are incorrect:
- A is wrong because it claims the environment was suitable but genes prevented reaching 6'5"; this contradicts the genetic screening that indicated potential for 6'5".
- C is wrong because it asserts Todd’s genotype restricted possible phenotypes so he could never reach 6'5"; again, the genotype actually allowed 6'5".
- D is wrong because passive genotype–environment correlations concern parents providing environments correlated with their genes, and the phrase “Todd sought out experiences” describes active correlation—neither explains an insufficient developmental environment causing reduced stature.

Conclusion: The best explanation is B) Todd experienced a less-than-ideal environment during development, such that he could never reach his 6'5 potential. This matches the provided answer.

Through advanced genetic screening, Todd was informed that he had the genetic potential to grow to 6'5. However, at age 35, Todd stands at about 5'10. Taking into account gene/environment interactions, how is this scenario best explained?单项选择题

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