Dihybrid Cross, Chi-square analysis, Pedigrees Flashcards

unit 2

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1
Q

what is Mendel’s principle of independent assortment

A

alleles on different pairs of chromosomes assort independently

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2
Q

when does independent assortment occur

A

during anaphase 1 of the meiotic cycle

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3
Q

the dihybrid cross will generate F1 parents that are _______ at each locus

A

heterozygous

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4
Q

Describe a test cross

A

the individual of unknown genotype must be crossed with a homozygous recessive individual

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5
Q

what information does a chi-square test give you

A

about how well observed values fit expected values. Indicates the probability that the difference between the observed and the expected values is due to chance (something other than mendelian genetics)

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6
Q

What is the equation for chi-square

A
x^2= [(O-E)^2]/ E 
O= observed 
E= expected
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7
Q

(autosomal recessive/dominant) usually appears in both sexes with equal frequency

A

recessive (both really tho)

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8
Q

(autosomal recessive/dominant) tend to skip generations

A

recessive

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9
Q

(autosomal recessive/dominant)

When both parents are heterozygous, approximately one fourth of the offspring will be affected

A

recessive

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10
Q

(autosomal recessive/dominant)

appears more frequently among the children of incest marriages

A

recessive

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11
Q

(autosomal recessive/dominant)

appears in both sexes with equal frequency

A

dominant (both really tho)

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12
Q

(autosomal recessive/dominant)

both sexes transmit the trait to their offspring

A

dominant

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13
Q

(autosomal recessive/dominant)

does not skip generations

A

dominant

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14
Q

(autosomal recessive/dominant)

affected offspring must have an affected parent unless they have a new mutation

A

dominant

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15
Q

(autosomal recessive/dominant)
when one parent is affected (heterozygous) and the other parent os unaffected, approximately half of the offspring will be affected

A

dominant

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16
Q

(autosomal recessive/dominant)

unaffected parents do not transmit the trait

A

dominant