BIOL140 Lecture Notes - Lecture 12: Dihybrid Cross, Punnett Square, British Thermal Unit

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21 Jun 2016
Department
Course
Professor
October 22nd, 2015
Inheritance
Patterns of genetic inheritance
Terms and Background Information
A)
Different forms of a gene
Brown eye allele
Blue eye allele
Green eye allele
Etc.
Genes for eye colour
Ex. Eye colour (trait)
Allele
1.
The allele's a person has in the gene pair
Genotype
2.
The physical traits a person has
Something you can see or measure
Phenotype
3.
Are pairs of chromosomes
Therefore, we also have gene pairs
Homologous Chromosomes
4.
Homozygous- same alleles
Heterozygous- Different allels
Compare alleles/genes in a pair
5.
Alleles that are expressed even when a different allele is present are called
dominant
Alleles that are expressed only if both alleles present are the same are called
recessive
Genes usually have one form that is expressed over another form
Two kinds of alleles (dominant, recessive) makes three possible combinations
Dominant, dominant
Dominant, recessive
Recessive, Recessive
(Homozygous Dominant)
(heterozygous)
(Homozygous recessive)
BB
Bb
bb
Ex. Trait: Earlobe Shape
A= an attached earlobe (Dominant)
Dominant/recessive
6.
a= an unattached earlobe (recessive)
Example #1
Example #2
Example #3
Example #4
Egg
A
A
a
a
Sperm
A
a
A
a
Zygote
AA
Aa
Aa
Aa
Unattached
Unattached
Unattached
attached
Has dominant and recessive alleles
Mendelian Genetics
Lecture Twelve and Thirteen
October 30, 2015
9:57 PM
BIO 140 Page 1
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