topic test chapters 8,9,10

Question 1

define genes

Answer 1

basic physical and functional unit of heredity. genes are made up of DNA and the two types of genes are dominant and recessive

Question 2

define dominant genes

Answer 2

displays characteristics despite the other gene

Question 3

define recessive gene

Answer 3

characteristics are only expressed when no dominant gene is present

Question 4

influence of genetic disorders

Answer 4

affects development and contributes to physical illness, mental illness and retardation. examples include Down syndrome, fragile x syndrome, alzheimers disease

Question 5

what is Down syndrome

Answer 5

an extra chromosome as a result of abnormal cell division and growth at conception

Question 6

what is fragile x syndrome

Answer 6

second most common cause of mental retardation

Question 7

nature nurture interactions.

Answer 7

interactions between genetics and environment