Flashcard Warm-up Genotype vs. Phenotype Genotype is the genetic makeup (AA, Aa, or aa) Phenotype is the physical trait, a result of the genotype Allele For any trait, such as hair color, there are different forms of the protein that create the different hair colors. Each different form is called an allele . We use capital letters to represent dominant alleles and lower case
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Flashcard Warm-up Genotype vs. Phenotype Genotype is the genetic makeup (AA, Aa, or aa) Phenotype is the physical trait, a result of the genotype Allele.
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Flashcard Warm-up
Genotype vs.
Phenotype
Genotype is the genetic makeup (AA, Aa, or aa)
Phenotype is the physical trait, a result of the genotype
AlleleFor any trait, such as
hair color, there are different forms of the protein that create the different hair
colors. Each different form is called an allele. We use
capital letters to represent dominant
alleles and lower case letters to represent the
recessive alleles.
Unit 10- GeneticsWhere did my traits come from??
Inheritance of chromosomes
Egg + sperm zygote
egg
sperm
zygote
fertilizationmitosis &development
meiosis
Traits: physical or physiological characteristics; like eye color, or blood type◦Phenotype:
individual’s observable trait; brown hair
Genes: Portion of DNA that make proteins that control our traits and are found on chromosomes. ◦Chromosomes exist in
pairs, one from sperm one from egg.
Alleles: different versions of genes; blue eye gene, brown eye gene; we use letters to represent alleles◦Alleles are inherited
separately from each parent.
How does this work?
eye color(brown?)
hair colo
r
hair colo
r
eye color
(blue?)
Paired chromosomes have same kind of genes◦ but may be different alleles
Genes affect what you look like
X BB
bb
Bb
Bb
Bb
Bb
Where did the blue eyes go??
Genes affect what you look like…
X Bb
bb
Bb
Bb
bb
bb
Why did the blue eyes stay??
What is a genotype and how do we write it?Genotype: the genetic makeup
◦ (the alleles you received from mom and dad)
Examples of genotypes:Homozygous: Identical copies;
AA – homozygous dominant aa - homozygous recessive
◦Dominant genes mask or hide recessiveHeterozygous: one dominant and one
recessive; Aa2 people can have the same
appearance but have different genetics: BB vs Bb
Mendelian Genetics:
Gregor Mendel : Father of Genetics◦Studied pea plants--- 1866◦Why pea plants?
Mendel’s PrinciplesThree Principles: 1. Principle of Dominance: dominant alleles
can mask/ hide recessive alleles◦ Homozygous dominant: AA; Dominant trait is