Unit 6 QA

Question 1

why would dissolved oxygen levels in a pond decrease during the night

Answer 1

photosynthesis does not occur and organisms consume the oxygen

Question 2

what are the reactants and products of photosynthesis

Answer 2

reactants = 6CO2 + 6H20 + Sunlight
products = C6H12O6 +6O2

Question 3

what are the reactants and products of respiration

Answer 3

reactants = C6H12O6 + O2
products = CO2+H2O + ATP

Question 4

what energy containing molecule is synthesized during respiration

Answer 4

ATP

Question 5

respiration is most efficient when what molecule is available

Answer 5

oxygen

Question 6

compare prophase and prophase 1

Answer 6

in prophase chromosomes condense to themselves but in prophase 1 they pair up with each other and exchange dna

Question 7

why must dna be replicated before mitosis

Answer 7

so there are copies of dna and each daughter cells gets a set of

Question 8

what process creates gametes

Answer 8

meiosis

Question 9

how does the number of chromosomes in a gamete compare to a somatic cell

Answer 9

gametes have half the chromosomes of a somatic cell (diploid and haploid)

Question 10

when a cell with 18 chromosomes undergoes mitosis how many chromosomes will the daughter cells have

Answer 10

18

Question 11

what are spindle fibers used for

Answer 11

to attach to chromosomes and hold them and pull apart

Question 12

what os the main consequence of crossing over

Answer 12

the could be genetic diversity

Question 13

what can create a gamete with an abnormal chromosome number

Answer 13

failure to cross over (nondisjunction)

Question 14

cross a homozygous dominant with heterozygous - what are the chances of having a heterozygous offspring

Answer 14

2/4 50%

Question 15

what happens to traits when their gene shows incomplete dominance

Answer 15

the phenotypes blend together

Question 16

a child sex is determined by which parent chromosome

Answer 16

dad