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Genetics > Chapter 24: Quantitative Genetics > Flashcards

Chapter 24: Quantitative Genetics Flashcards

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Biology 101 flashcards
1
Q

Quantitaive Genetics

A

genetic analysis of complex characteristics

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2
Q

Disconinuous (Qualitative) Traits

A

possess only a few phenotypes

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3
Q

What exhibits only a few, easily distinguishable phenotypes?

A

discontinuous (qualitative) traits

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4
Q

Continuous (Quantitative) traits

A

characteristics vary along a scale of measurement with many overlapping phenotypes

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5
Q

What trait has multiple alleles at multiple alleles at multiple loci?

A

continous (quantitative) traits

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6
Q

What does quantitative refer to?

A

number of genes involved

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7
Q

What trait exhibits a continuous range of phenotypes?

A

continuous (quantitative) traits

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8
Q

Why are relationships between genotype and phenotype complex?

A

-may be polygenic
-may have environmental influences

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9
Q

What is determined by genetic and environmental factors, and can be measured in whole numbers?

A

meristic characteristics

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10
Q

What characteristic is measured by presence or absence?

A

threshold characteristic

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11
Q

What characteristic looks like a mendalian trait?

A

threshold characteristics

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12
Q

What characteristics are susceptible to disease?

A

threshold characteristics

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13
Q

What does polygenic inheritance?

A

refers to quantitative characteristics controlled by cumulatice effects on many genes

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14
Q

What does each polygenic inheritance character still follow (as long as they aren’t linked)?

A

mendel’s rules

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15
Q

What are polygenic inheritance characteristics possibly influenced by?

A

environmental factors

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16
Q

As the number of _____ affecting the trait increases, the number of phenotypic classes ____

A

loci; increases

17
Q

What is n?

A

number of loci with a segregating pair of alleles that affect the characteristic

18
Q

What are the chromosomal regions containing genes that influence a quantitative trait?

A

quantitative trait loci (QTLs)

19
Q

What is accomplished by genome comparison?

A

mapping QTLs

20
Q

What was relied on before QTLs?

A

DNA fragmenting patterns

21
Q

What is phenotypic variation due to genetic variability?

A

heritability

22
Q

Pleiotropy

A

different phenotypes impacted by the same gene(s)

23
Q

How many traits are needed for pleiotropy?

A

needs two characteristics to be related

Genetics (12 decks)

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