Unit 3: Chromosomes

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18 Terms

1

Genes located on chromosomes =

gene locus

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2

Y chromosome determines

sex

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3

SRY gene is expressed

-> testes develop

-> testosterone

-> male

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4

If no SRY

female default pathway → ovaries

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5

One X inactivated during embryonic

development →

Barr body (see nuclear

envelope)

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6

how many Barr body in males

0

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7

How many Barr body in female

1

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8

Females are ____ for X-linked traits

mosaics

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9

Chromosomal abnormalities

Can occur due to sperm or egg in meiosis

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10

Non-disjunction

Meiotic spindle error

Sister chromatids do not disjoin in anaphase I or II

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11

abnormal number of chromosomes

Aneuploidy

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12

Monosomy

Turner syndrome

Only viable monosomy in humans

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13

Trisomy 21

Down syndrome

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14

Deletion

fragment lost

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15

Duplication

repeated fragment

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16

Translocation

fragment attaches to other chromosome

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17

Inversion

fragment break → inverts

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18

Non disjunction in meiosis can lead to

aneuploidy in offspring

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