5.2: The influence of genes on behaviour Flashcards
Researchers investigating the possible genetic cause of a mental illness decided to use data on twin concordance rates to ascertain the possible level of genetic influence.
MZ (identical) twins were 30% concordant and DZ (non-identical) twins were 15% concordant.
The researchers used these figures to conclude that there is a genetic influence on developing the illness.
Explain why they were justified in reaching this conclusion (3 marks)
They were justified in reaching this conclusion, because the concordance rates for MZ twins were greater than for DZ twins
Researchers investigating the possible genetic cause of a mental illness decided to use data on twin concordance rates to ascertain the possible level of genetic influence.
MZ (identical) twins were 30% concordant and DZ (non-identical) twins were 15% concordant.
The researchers used these figures to conclude that there is a genetic influence on developing the illness.
Explain why they were justified in reaching this conclusion (3 marks).
They were justified in reaching this conclusion, because the concordance rates for MZ twins were greater than for DZ twins.
What does this mean?
This means that if one MZ twin had the mental disorder, then there was a greater chance of their twin developing the disorder (30 per cent concordance rate)
Researchers investigating the possible genetic cause of a mental illness decided to use data on twin concordance rates to ascertain the possible level of genetic influence.
MZ (identical) twins were 30% concordant and DZ (non-identical) twins were 15% concordant.
The researchers used these figures to conclude that there is a genetic influence on developing the illness.
Explain why they were justified in reaching this conclusion (3 marks).
They were justified in reaching this conclusion, because the concordance rates for MZ twins were greater than for DZ twins.
This means that if one MZ twin had the mental disorder, then there was a greater chance of their twin developing the disorder (30 per cent concordance rate), than what?
This means that if one MZ twin had the mental disorder, then there was a greater chance of their twin developing the disorder (30 per cent concordance rate), than there was for a DZ twin developing the disorder if their twin had the disorder (15 per cent concordance rate)
