Tetrad Analysis and Gene Interaction Flashcards

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1
Q

MI Type segregation pattern

A

4:4 segregation and no crossing over

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2
Q

MII Type segregation pattern

A

2:2:2:2 segregation; both alleles are present in both halves of the ascus; crossing over

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3
Q

What are the 4 different MII segregation patterns?

A

2:2:2:2 (A a A a), 2:2:2:2 (a A a A), 2:4:2 (A a a A), 2:4:2 (a A A a)

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4
Q

Independent Assortment

A

results in 50% parental ditype and 50% non parental ditype

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5
Q

What is the map distance b/w centromere and locus limited to?

A

33 m.u.

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6
Q

Complete linkage

A

results in only parental ditype

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7
Q

Parental ditype

A

all 4 parental; no crossing over; w/ MII segregation there is crossover between locus and centromere, but no crossing over b/w loci

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8
Q

Non parental ditype

A

all 4 recombinant

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9
Q

Tetratype

A

1/2 recombinant and 1/2 parental; single crossing over of 2 chromatids or double crossing over involving three chromatids

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10
Q

Distance formula (according to discussion material)

A

(1/2 (TT) + NPD)/total x 100

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11
Q

Penetrance

A

frequency w/ which a genotype expresses a phenotype; a trait has low penetrance if few individuals w/ the gene express it

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12
Q

Expressivity

A

degree to which a trait is expressed in individuals having the gene; ex: severity of genetic diseases such as cleft palate in humans

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13
Q

Sex-limited traits

A

expression of certain traits is only in one of the sexes; traits encoded by genes on autosomes but character is expressed in one sex; ex: milk production in cows

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14
Q

Multiple Alleles

A

blood groups (A B O groups); IA, IB, i

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15
Q

Incomplete dominance

A

presence of intermediate phenotype (heterozygous is different from homozygous dominant); ex: red, pink, and white flowers

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16
Q
A