Chapter 7 Handout

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what is segregation

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21 Terms

1

what is segregation

partitioning of genetic material into two daughter cells

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2

law of independent assortment

states that random orientation of homologous chromosome pairs during metaphase I allow for the production of gametes with diff assortments of homologous chromosomes

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3

linked genes

the principle that genes that are physically close to eachother on a chromosome tend to not get separated in meiosis and recombine

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4

what happens to genes in linkage

genes/alleles that are physically close on the chromosome are inherited together

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5

if two genes are on the same chromosome, and crossing over doesnt occur, what is the recombination frequency?

0%

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6

when is there complete linkage between genes?

when there is no crossing over between them and recombination is 0%

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7

in meiosis, how many genetically different gametes does complete linkage produce

two

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8

if two genes are on different chromosomes, or the same and the recombination frequency is 50% what does this mean

they are not linked

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9

if recombination frequency is 0%

it is complete linkage

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10

if recombination frequency is 10%

it is linkage

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11

if recombination frequency is 50%

it is no linkage

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12

if recombination frequency is 20%

it is linkage

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13

genes that are inherited as a group are termed as what

a linkage group

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14

what did morgan postulate

that genes exist in a linear order on the chromosome

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15

how is the distance of genes from eachother calculated

recombination frequencies

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16

how is the distance between chromosome positions measured?

map units (mu), genetic map unit (gmu), or centimorgan (cM)

1 mu = 1 gmu = 1 cM = % recombination frequency btwn genes

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17

gene mapping refers to the process of determining the what of genes on chromosomes

location

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18

single crossover is for what

determining the distance between two linked genes

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19

double crossovers determine the distance and what of genes

distance and order between genes

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20

what is the double crossover frequency if the single crossover frequency is 20% and 30%

6%

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21

what is the double crossover frequency if the single crossover frequency is 2% and 3%

.06%

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