Download presentation
Presentation is loading. Please wait.
Published byEva Kovářová Modified over 6 years ago
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
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.