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8.2 Sex Determination and Sex Linkage Flashcards

(12 cards)

1
Q

Humans contain…?

A

22 pairs of Autosomes and 1 pair of Sex Chromosomes

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2
Q

Women have what chromosomes?

A

2 X chromosomes

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3
Q

Men have what chromosomes?

A

One X and one Y chromosome

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4
Q

Sex-Linked Genes

A

Genes located on the sex chromosomes

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5
Q

X-Linked

A

Located on the X chromosome

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6
Q

Y-Linked

A

Located on the Y chromosome

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7
Q

What is the SRY gene?

A

It leads to the development of the testes

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8
Q

Who do males inherit the X from?

A

Their mothers

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9
Q

Why are males more likely to express recessive X-linked traits than females?

A

Because they carry only 1 X

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10
Q

Why are females less liked to express X-linked traits?

A

Because they have 2 copies of the bad X’s

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11
Q

X inactivation

A

Guarantees that all females receive only 1 dose of the proteins by the X chromosome

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12
Q

Is Inactivation reversible? How is it inherited?

A

Inactivation is irreversible and it is inherited during cell division when RNA begins wrapping around the X chromosome

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