Unit 6 QA Flashcards
why would dissolved oxygen levels in a pond decrease during the night
photosynthesis does not occur and organisms consume the oxygen
what are the reactants and products of photosynthesis
reactants = 6CO2 + 6H20 + Sunlight
products = C6H12O6 +6O2
what are the reactants and products of respiration
reactants = C6H12O6 + O2
products = CO2+H2O + ATP
what energy containing molecule is synthesized during respiration
ATP
respiration is most efficient when what molecule is available
oxygen
compare prophase and prophase 1
in prophase chromosomes condense to themselves but in prophase 1 they pair up with each other and exchange dna
why must dna be replicated before mitosis
so there are copies of dna and each daughter cells gets a set of
what process creates gametes
meiosis
how does the number of chromosomes in a gamete compare to a somatic cell
gametes have half the chromosomes of a somatic cell (diploid and haploid)
when a cell with 18 chromosomes undergoes mitosis how many chromosomes will the daughter cells have
18
what are spindle fibers used for
to attach to chromosomes and hold them and pull apart
what os the main consequence of crossing over
the could be genetic diversity
what can create a gamete with an abnormal chromosome number
failure to cross over (nondisjunction)
cross a homozygous dominant with heterozygous - what are the chances of having a heterozygous offspring
2/4 50%
what happens to traits when their gene shows incomplete dominance
the phenotypes blend together
