Question

benny has been diagnosed with a gene - linked abnormality characterized by deceleration of mental and physical development caused by an accumulation of lipids in the nervous system. he has been put on medication and a special diet, but his family has been told that he will probably not live beyond the age of 5. benny is suffering from
spina bifida.
tay - sachs disease.
phenylketonuria.
huntington disease.
question 5 (4 points)
tracys parents are avid sports fans. since she was a child, theyve taken her to numerous baseball and football games, and tracy regularly watched the sports channel with her dad. when she was old enough, her parents made her join the little league team at her school and she performed well. this is an example of a(n)
evocative genotype - environment correlation.
active (niche - picking) genotype - environment correlation.
passive genotype - environment correlation.
gene - gene correlation.

Explanation:

First Question (Benny's Disease)

• Spina bifida is a neural tube defect affecting the spine, not related to lipid accumulation in the nervous system.
• Tay - Sachs disease is a gene - linked disorder where lipids accumulate in the nervous system, leading to developmental deceleration and a short lifespan (often not beyond 5 years), matching Benny's symptoms.
• Phenylketonuria (PKU) involves problems with amino acid metabolism, not lipid accumulation.
• Huntington disease is a neurodegenerative disorder with onset in adulthood, not in early childhood with lipid accumulation.

• Evocative genotype - environment correlation is when a person's genotype evokes certain responses from the environment; this is not the case here as Tracy's parents are providing the environment based on their interests.
• Active (niche - picking) correlation is when an individual actively seeks out environments based on their genotype; Tracy is not actively seeking but is placed in the environment by her parents.
• Passive genotype - environment correlation occurs when parents provide an environment that is correlated with their own genotypes (and thus the child's genotype). Tracy's parents, being sports fans, provide a sports - related environment for Tracy, which is a passive correlation as Tracy is passively exposed to this environment.
• Gene - gene correlation is about the relationship between different genes, not genotype - environment.

Answer:

B. Tay - Sachs disease

Second Question (Tracy's Genotype - Environment Correlation)