Chromosomal Inheritance Flashcards

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1
Q

what is a pedigree?

A

chart that diagrams the inheritance of a trait or condition through generations of a family

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2
Q

Humans and other mammals have two types of sex
chromosomes

A

a larger X chromosome and a smaller Y chromosome

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3
Q

A person with two X chromosomes usually develops anatomy we associate with the…

A

Female

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4
Q

properties are associated with the inheritance of one X
and one Y…

A

Male

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5
Q

Gene SRY (sex-determining region on the Y) does what

A

is responsible for the development of the testes in a developing baby in utero

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6
Q

For a recessive X-linked trait to be expressed:

A

-A female needs two copies of the allele (homozygous)
-A male needs only one copy of the allele (hemizygous)

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7
Q

What is X inactivation?

A

one of the two X chromosomes in each cell is randomly inactivated during embryonic development

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8
Q

What does the inactive X condense into

A

Barr body

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9
Q

What is gene linkage?

A

the closer the genes are to each other, the more likely they are inherited together

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10
Q

what is an Abnormal Chromosome Number?

A

of chromosomes taken or given

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11
Q

what is Aneuploidy

A

abnormal number of chromosomes, less or more than 2

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12
Q

a monosomic zygote is what

A

has only one copy out of two of a particular chromosome

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13
Q

a trisomic zygote is what

A

has three copies instead of two of a particular chromosome

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14
Q

Nondisjunction

A

improper separation during miosis

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15
Q

translocation

A

switch of large portions of chromosomes

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