Mendelian Genetics Flashcards

1
Q

Mendelian Genetics started with observation that there were:

A

Tiny humans, or homunculus!

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2
Q

From the homunculus, this was concluded.

A

Inheritance

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3
Q

Mendel’s original hypothesis?

A

Factors in parents. Get one from each!

Depending on what factors, would influence appearance.

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4
Q

P =

A

Parental generation - always true breeding

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5
Q

F1 =

A

First Filial - All offspring of PxP

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6
Q

F2 =

A

Second Filial - All offspring of F1xF1

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7
Q

Mendel’s 2 Laws of Inheritence?

A

Law of Segregation - Each parent has 2 copies of gene, 1 copy only in gamete.
Law of Independent Assortment - How those genes line up is random

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8
Q

F2 generation phenotypic ratio?

A

3:1

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9
Q

An organisms characteristic (Color/Position)

A

Trait

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10
Q

Specific characteristic expression of trait (Purple/Wrinkled)

A

Phenotype

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11
Q

A segment of DNA that encodes for a protein.

A

Gene

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12
Q

First Concept related to above was:

A

Variations of inherited traits (different forms of gene)

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13
Q

Second Concept of Mendel?

A

Always have 2 genes, but form of genes may be different!

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14
Q

Diploid =

A

Two copies of every gene, existing in homologous chromosomes

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15
Q

Locus =

A

Where the gene exists on the chromosome

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16
Q

Allele =

A

Form of a gene, two copies. One from each parent

17
Q

Third concept of Mendel?

A

Some alleles are DOMINANT!

18
Q

T/F Dominant allele can mask the presence of another

19
Q

PP or pp

A

Homozygous Dominant or Recessive

20
Q

Pp or pP

A

Heterozygous

21
Q

Heterozygous are also known as “______”

22
Q

Fourth Concept of Mendel?

A

Law of Segregation! Alleles separate in meiosis into different gametes

23
Q

How do alleles split?

A

In Anaphase I - each daughter has one, in Anaphase II - four gametes, each with their own chromatid. Therefore, gametes only have ONE allele. Always in a 50/50 Split!

24
Q

Cross involving one trait?

A

Monohybrid Cross

25
Cross involving two traits?
Dihybrid Cross
26
In a monohybrid cross of purple & white flowers genotypes would be? And gametes?
PP x pp (Genotype) | PP or pp
27
Phenotypic ratio in F2 generation of Monohybrid cross?
3:1
28
Genotypic ratio of F2 in Monohybrid cross?
1:2:1
29
In probability when we say 'and' we ______ and when we say 'or' we ______ the probabilities.
Multiply - And | Add - Or
30
The testcross is a tool to determine an _______ _________.
Uknown Genotype - what the possible parent types were.
31
The Law of Independent Assortment looks @
2 Character Traits
32
To look at 2 character traits we use a:
Dihybrid cross
33
Phenotypic ration of dihybrid cross?
``` 9:3:3:1 YR Yr yR yr YR Yr yR yr ```
34
Trihybrid phenotypic ratio?
1:6:15:20:15:6:1