Unit 6 QA Flashcards

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1
Q

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

A

photosynthesis does not occur and organisms consume the oxygen

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2
Q

what are the reactants and products of photosynthesis

A

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

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3
Q

what are the reactants and products of respiration

A

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

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4
Q

what energy containing molecule is synthesized during respiration

A

ATP

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5
Q

respiration is most efficient when what molecule is available

A

oxygen

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6
Q

compare prophase and prophase 1

A

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

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7
Q

why must dna be replicated before mitosis

A

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

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8
Q

what process creates gametes

A

meiosis

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9
Q

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

A

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

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10
Q

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

A

18

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11
Q

what are spindle fibers used for

A

to attach to chromosomes and hold them and pull apart

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12
Q

what os the main consequence of crossing over

A

the could be genetic diversity

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13
Q

what can create a gamete with an abnormal chromosome number

A

failure to cross over (nondisjunction)

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14
Q

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

A

2/4 50%

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15
Q

what happens to traits when their gene shows incomplete dominance

A

the phenotypes blend together

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16
Q

a child sex is determined by which parent chromosome

A

dad