Ch 11 Flashcards

0
Q

True breeding

A

All children have same traits

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1
Q

Genetics

A

Study of heredity

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2
Q

Hybrid

A

Kids whose parents had different traits

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3
Q

Trait

A

A specific characteristic

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4
Q

Gene

A

DNA code for a trait

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5
Q

Allele

A

The gene options

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6
Q

Fertilization

A

Sperm meeting egg

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7
Q

Gamete

A

Sex cell (sperm or egg)

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8
Q

Zygote

A

Cell when sperm and egg meet

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9
Q

Gregor Mendel

A

Austrian monk born 1822
Studied genetics and taught high school
Keep meticulous quantitative data

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10
Q

Gregor Mendel’s experiment on pea plants

A

Very short reproductive lines
Simple control of offspring
Many obvious traits
Able to selectively breed or self pollinate

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11
Q

(Mendel’s crosses) p

A

The two parent plants

Two different true breeding (yellow and green)

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12
Q

(Mendel’s crosses) F1

A

The first generation (p x p)

All offspring have same allele (green)

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13
Q

(Mendel’s crosses) f2

A
Second generation (f1 x f1) 
1/4 of offspring have a different allele than parents (3/4 green and 1/4 yellow)
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14
Q

(Mendel’s conclusions) An individuals characteristics (traits) are determined by

A

Factors (genes) that are passed from one parent generation the next

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15
Q

(Mendel’s conclusions) an individual gets

A

One allele from each parent

16
Q

(Mendel’s conclusions) principle of dominance

A

Some alleles are dominant (always appear) and others are recessive (hidden by the dominant)

17
Q

(Mendel’s conclusions) Law of segregation

A

During gamete formation the alleles for each gene separate from each other, so that each gamete carries only one allele for each gene

18
Q

Homozygous

A

Having two of the same alleles

19
Q

Heterozygous

A

Having two different alleles

20
Q

Phenotype

A

The appearance of the individual

21
Q

Genotype

A

The allies in their genes (DNA)

22
Q

Probability

A

The chance that a particular event will occur

23
Q

Allies are represented by

24
Alleles (referring to Punnett square)
= genotype = phenotype = probability
25
Genotype ratio 1:2:1
Always homozygous dominant : heterozygous: homozygous recessive
26
Phenotype ratio
Dominant to recessive
27
Two factor cross
A huge Punnett square with 4 columns and 4 rows | Looks at how two different traits are inherited together
28
Dihybrid
Both parents are heterozygous for both traits | Phenotype ratio 9:3:3:1 ratio
29
Independent assortment
Genes for different traits can segregate independently during formation of gametes (this gets way more complicated)
30
Mendel's principles
Inheritance of biological characteristics is determine by individual units called genes which are passed from parents to offspring Where two or more forms (alleles) of the gene for a single trait exits, some alleles may be dominant and others may be recessive In most sexually reproducing organisms each adult has two copies of each gene - one from each of their parents. These genes segregate from each other when gametes are formed Alleles for different genes usually segregate independently of each other
31
Incomplete dominance
Neither allele is dominant Heterozygous phenotype is a mix Example: red and white = pink (Allele letters are both capital)
32
Codominance
Neither allele is dominant Heterozygous phenotype is a mix Example: red and white = roan(candy cane) (Allele letters are both capital)
33
Multiple alleles
There are more than two options | Example = rabbit coat color
34
Polygenic traits
Several genes produce many different traits Human skin color Four different genes control the trait
35
Environmental affects
The environment can affect gene expression and influence genetically determine traits
36
Meiosis
Process by which gametes are formed Contain half the normal number of chromosomes as somatic cells Known as "haploid" and number of chromosomes in this state is represented as "n = ____" Diploid number is represented as "2n = ______"
37
Mechanics of meiosis
Cause genetic reshuffling to occur at random and can result in genetic reshuffling producing new allele combinations