Bio Unit 3&4 Exam

Question 1

DNA

Answer 1

genetic code; contains the instructions which create the organisms characteristics.

Question 2

Rungs of DNA

Answer 2

Rungs of DNA
guanine (G)
-
cystosine(C)
-
adenine (A)
-
thiamine (T)
-

Question 3

Chromosomes

Answer 3

package of DNA

Question 4

Dominant trait

Answer 4

trait that if present will overcome a recessive trait

ex. Bb
^

Question 5

Recessive trait

Answer 5

trait that if a dominant trait is present will hide, but not if there are two recessive traits

ex. Bb
^

Question 6

Genes

Answer 6

segment of DNA with coded instructions

Question 7

mitosis

Answer 7

process that produces two identical cells with the same number of chromosomes

(asexual)

Question 8

meiosis

Answer 8

cell division that produces four sex cells each with half the genetic material of the original cell

(sexual)

Question 9

purebred

Answer 9

if genes are alike

ex YY or yy

Question 10

hybrid

Answer 10

if genes are different

ex Yy

Question 11

genotype

Answer 11

set of genes an organism carries

Question 12

phenotype

Answer 12

characteristics you see

Question 13

incomplete dominance

Answer 13

when an organism is neither truly dominant or recessive

Question 14

overspecialization

Answer 14

species has adaptations for a small set of environmental conditions- leaves it vulnerable to extinction