topic test chapters 8,9,10 Flashcards
1
Q
define genes
A
basic physical and functional unit of heredity. genes are made up of DNA and the two types of genes are dominant and recessive
2
Q
define dominant genes
A
displays characteristics despite the other gene
3
Q
define recessive gene
A
characteristics are only expressed when no dominant gene is present
4
Q
influence of genetic disorders
A
affects development and contributes to physical illness, mental illness and retardation. examples include Down syndrome, fragile x syndrome, alzheimers disease
5
Q
what is Down syndrome
A
an extra chromosome as a result of abnormal cell division and growth at conception
6
Q
what is fragile x syndrome
A
second most common cause of mental retardation
7
Q
nature nurture interactions.
A
interactions between genetics and environment
