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What is Heredity? _____________- is the Study OF Genes/Heredity.

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Presentation on theme: "What is Heredity? _____________- is the Study OF Genes/Heredity."— Presentation transcript:

1 What is Heredity? _____________- is the Study OF Genes/Heredity

2 Chromosome Review Humans have 46  23 pairs
Each pair consists of one chromosome from mom & one from dad Types of Chromosomes Sex chromosomes - 23rd pair ____________

3 __________ Sex Chromosomes

4 Genes & Alleles Gene – sequence of DNA coding for a protein  determines a trait     _________– alternate/different forms of a gene Example: Height = Tall or short      

5 Who was Gregor Mendel? The Father Of Modern__________
Used pea plants to study the inheritance of ________

6 Mendel’s Discoveries:
_____________Alleles - same 2 alleles _________Alleles - 2 different alleles

7 Dominant Allele – always________
Recessive Allele - only expressed if homozygous _________

8 Principle of _________– some alleles are dominant and others are__________
Phenotype - physical expression/characteristics of the gene __________– genetic makeup of an organism

9 Mendelian Laws: Law of ___________– each individual carries a pair of alleles for each trait and these alleles will separate to form gametes Law of Independent ___________- each trait will separate independently of all other traits.

10 Punnett Squares

11 Punnett Squares Show possible gene combinations – hybrids
Principle of_______________

12 How to use: _____________Cross = Aa x Aa A = Freckles a = No Freckles
Genotype ratio: 1:2:1 AA = 1 Aa = 2 aa = 1 Phenotype ratio: 3:1 With freckles = 3 No freckles = 1

13 Column & Row Letters They represent _________from one of the parents

14 Dihybrid Cross: RrYy x RrYy
R = Smooth r = Wrinkled Y = Yellow y = Green Use the _________method (first, outer, inner, last) to produce gamete combinations Female: RrYy Male: RrYy Gametes Gametes RY RY Ry Ry rY rY ry ry

15 _____________Cross Phenotype ratio: 9:3:3:1 Smooth & Yellow = 9
Wrinkled & Yellow = 3 Smooth & Green = 3 Wrinkled & Green = 1


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