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Genetics > Lecture 13 > Flashcards

Lecture 13 Flashcards

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Biology 101 flashcards
1
Q

what is the unit of transmission in meiosis?

A

chromosomes

not genes

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1
Q

linked genes can not undergo…

A

independent assortment

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2
Q

frequency of crossing over on a single chromosome is proportional to…

A

distance between them

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3
Q

crossing over results in

A

recombination

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4
Q

chromosome maps indicate

A

relative location of genes on chromosome

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5
Q

three consequences of linkage in meiosis

A

independent assortment
linkage without crossing over
linkage with crossing over

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6
Q

linkage without crossing over is called

A

complete linkage

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7
Q

is linkage exhibited in independent assortment

A

no

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8
Q

linkage with crossing over

A

generates recombinant gametes

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9
Q

what does complete linkage produce

A

parental (noncrossover) gametes

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10
Q

crossing over occurs between

A

non-sister chromatids

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11
Q

crossing over produces what

A

both parental and recombinant gametes

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12
Q

the number of linkage groups corresponds to

A

haploid number of chromosomes

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13
Q

linkage ratio refers to

A

phenotypes

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14
Q

chiasmata are

A

synapsed chromosomes in meiosis that wrap around each other

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15
Q

what shape are chiasmatas

A

x-shaped intersection with points of overlap
(points of genetic exchange)

16
Q

percentage of offspring resulting from recombinant gametes depends on?

A

distance between two genes on same chromosome

17
Q

what is less likely to have a chiasma

A

two genes located close to each other along a chromosome

18
Q

the frequency of crossing over is…

A

proportional to distance between any two loci on single chromosome

19
Q

one cM corresponds to about how many base pairs in humans on average

A

1 million

20
Q

relative distance between two loci influences amount of…

A

recombination and crossing over

21
Q

the closer the loci reside the …..

A

less likely of single-crossover event

22
Q

the farther apart the loci…

A

the more random crossover

23
Q

single crossovers are when..

A

two linked genes are greater than 50 map units apart

24
Q

double crossovers result from

A

double exchanges of genetic material

25
Q

three-point mapping criteria

A
  • genotype of organism producing crossover gametes must be heterozygous at all loci
  • cross must be constructed to determine genotype of all gametes by observing phenotypes of offspring.
    -Sufficient number of offspring must be produced for representative sample crossover.

Genetics (6 decks)

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