An Expert Team of Scientists Compared 1,000 Sets of Monozygotic

question 98

Multiple Choice

An expert team of scientists compared 1,000 sets of monozygotic twins reared by their biological parents (Caspi et al., 2004) . The researchers asked the mothers to describe each twin. Descriptions ranged from very positive to very negative. The researchers measured personality at age 5 (including antisocial behavior as reported by kindergarten teachers) and then measured each twin's personality two years later. The results revealed that _____.

• A) if mothers were more negative toward one of their twins, that twin became more antisocial at age 7 than at age 5
• B) if mothers were less negative toward one of their twins, that twin became more antisocial at age 7 than at age 5
• C) if mothers were more negative toward one of their twins, that twin became less antisocial at age 7 than at age 5
• D) there was no relation between maternal negativity and child antisocial behavior

---

Definitions:

Biological Controls

The use of living organisms, such as predators, parasites, or pathogens, to suppress pest populations and manage ecosystems.

Parasitic Wasps

Insects that play a beneficial role in agriculture by laying their eggs in or on the bodies of other insect pests, eventually killing them.

Ladybugs

Small, dome-shaped insects with distinctive red and black spots, known for their beneficial role in controlling pest populations.

Genetic Engineering

The manipulation of an organism's genes using biotechnology, often involving the transfer of specific traits, or genes, from one organism or species to another to improve or change characteristics.