Exam 2 Flashcards

1
Q

Mendel studied:

A

autosomal inheritance

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2
Q

Gene

A

holds two alleles, influences a particular trait

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3
Q

allele

A

a particular form of gene

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4
Q

Genotype

A

a listing of the alleles of particular genes in an individual

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5
Q

phenotype

A

an individual’s observable traits

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6
Q

homozygous

A

having two of the same allele

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7
Q

heterozygous

A

having two different alleles

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8
Q

autosomal

A

a chromosome that isn’t sex

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9
Q

a gamete carries _____

A

1 allele for each trait

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10
Q

Principle of separation

A

allele pairs split from each other during the production of gametes

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11
Q

monohybrid cross

A

cross between two heterozygotes

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12
Q

Monohybrid cross (Rr) genotype values

A

1/4 RR
2/4 Rr
1/4 rr

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13
Q

monohybrid cross (Rr) phenotype values

A

3:1

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14
Q

what principle does monohybrid cross show?

A

principle of segregation

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15
Q

Independent assortment

A

alleles of different genes (seed shape and color) are transmitted independently of each other

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16
Q

dependent assortment

A

alleles of different genes (seed shape and color) are transmitted together

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17
Q

both

A

rule of multiplication

18
Q

either, or

A

rule of addition

19
Q

dihybrid cross

A

two traits

20
Q

Offspring genotypes values (RrYy x RrYy)

A

9/16 R-Y-
3/16 R-yy
3/16 rrY-
1/16 rryy

21
Q

Offspring phenotype values (RrYy x RrYy)

A

9/16 R-Y-
3/16 R-yy
3/16 rrY-
1/16 rryy

22
Q

what principle does dihybrid cross show?

A

principle of independent assortment

23
Q

how does meiosis explain principle of segregation

A

separation of homologous chromosomes in anaphase 1

24
Q

how does meiosis explain principle of independent assortment

A

Genes on different chromosomes assort independently in Meiosis 1
(4 types of gametes are produced)

25
chromosome theory of inheritance
-genes are located on chromosomes - independent alignment and separation of homologous chromosomes in Meiosis 1
26
homogametic vs. heterogametic
XX vs. XY EXCEPTIONS: fish, birds, butterflies, moths (ZZ, ZW)
27
what supports chromosome theory of inheritance
X-linked inheritance
28
what violates the principle of independent assortment and why?
Linkage -alleles are inherited together -DIFFERENT than sex-linked genes -two, rather than four, types of gametes
29
crossing over
alleles on the same chromosomes don't always stick together (four types of gametes)
30
crossing over and meiosis 1 relationship
-only in females
31
polymorphic traits: Codominance
expression of both alleles in a heterozygote
32
Polymorphic traits: Incomplete dominance
heterozygote is mixture of parents
33
Incomplete dominance flower color ex
red (RR) white (rr) pink (Rr) 1/4 (RR) 1/4 (Rr) 1/4(Rr) 1/4 (rr)
34
Pleiotropy
one gene affects many traits (ex: diseases)
35
Influences on phenotypes: Gene-Gene
different genes work together to affect the phenotype
36
influences on phenotypes: Environment
combined affects of genes and environment Rose comb (RRpp) x Pea comb (rrPP) = all walnut combs
37
epistasis
expression of phenotype of one gene is masked by phenotype of another
38
discrete vs. quantitiative (continuous) traits
(ex: kernel color) Aa Bb Cc thing
39
Extensions of Mendel's work:
1. Inheritance of genes on same chromosome 2. More than two alleles 3. Other allele phenotypes 4. Gene influences on traits 5. other influences on phenotypes 6. Quantitative traits
40