8.3 Continued… Studying Heredity

Slides:



Advertisements
Similar presentations
Exploring Mendelian Genetics
Advertisements

1 Review What is probability Use Models How are Punnett squares used to predict the outcomes of genetic crosses 2 Review What is independent assortment.
Monohybrid & Dihybrid Crosses
So I am looking at 2 characters how many traits am I studying? I WANT PURPLE FLOWERED, YELLOW- SEEDED PEA PLANTS.
Punnett Square Practice Problems. Create a punnett square to determine percent probabilities of genotypes and phenotypes of the offspring of a pea plant.
Applying Mendel’s Principles Probability, Punnett Squares, & Independent Assortment (Dihybrid Cross) Section 11.2.
Dihybrid Crosses. Let’s review So far, we have looked only at different types of monohybrid crosses –the inheritance of only ONE trait at a time –Ex:
DIHYBRID CROSSES ( 2 traits)
Genetic Crosses Section 9.2. Genotype  The genetic makeup of an organism  Consists of the alleles that the organism inherits from its parents  Example:
Exploring Mendelian Genetics. Independent Assortment Does the segregation of one pair of alleles affect the segregation of another pair of alleles? –Mendel.
Dihybrid Crosses. Crosses that involve 2 traits 4 x 4 Punnett Square (16 total boxes) 2 traits in peas: R = RoundY = Yellow r = Wrinkledy = Green.
1. What traits do you get from your parents? 2. Which traits don’t you get from your parents?
The study of inheritance of traits.  Austrian Monk  Studied how traits were passed from parent to offspring  His ideas forms the foundation for the.
Punnett Squares (don’t need to copy) In 1905 Reginald Punnett, and English biologist devised a shorthand way of finding the expected proportions of possible.
Introduction to Genetics
Heredity and Mendel.
Dihybrid Inheritance Dihybrid inheritance refers to the simultaneous inheritance of two characters.
Introduction to Mendelian Genetics
Using Phenotype Genotype to determine.
BIOLOGY 12 Punnett Squares.
GENETICS AND HEREDITY.
Dihybrid Cross.
Exploring Mendelian Genetics
Genetics basics Mendelian activity.
GENETICS AND HEREDITY.
Studying the inheritance of two characters simultaneously SBI3U
Dihybrid Inheritance Dihybrid inheritance refers to the simultaneous inheritance of two characters.
Dihybrid Crosses.
Genetics Gregor Mendel *The father of genetics.
Mendel’s Theory.
Mendelian Genetics Chapter 10.2.
Heredity The passing of characteristics from parent to offspring.
Studying the inheritance of two characters simultaneously
Applying Mendel’s Principles
PROBABILITY & PUNNETT SQUARES 11-2
Heredity and Genetics Part Two Dihybrid Crosses
Punnett Squares Spring 2018.
Chapter 9: Fundamental Genetics
Mendelian Genetics 12/6/2018 Mendel’s Laws.
Multi-trait inheritance
Mendel’s Laws of Heredity
Inheritance Patterns Law of Segregation follows inheritance of 2 alleles for a single gene represented by monohybrid crosses Law of Independent Assortment.
GENETICS -2A Gregor Mendel.
Heredity and Genetics Part Two Dihybrid Crosses
Incomplete Dominance and Codominance
Applying Mendel’s Principles
Heredity and Genetics Dihybrid Crosses
Heredity and Genetics Part Two Dihybrid Crosses
Lesson Outline Gregor Mendel Genetic Laws and Principles Crosses
11-3 Exploring Mendelian Genetics
Section 2: Probability and Heredity
Mendel’s Second Experiment
Heredity The passing of characteristics from parent to offspring.
What is Heredity? _____________- is the Study OF Genes/Heredity.
Punnett Square Practice Problems.
Unit 8: Mendelian Genetics
Studying the inheritance of two characters simultaneously
Genetics 4-3 Genetics Minute Video: 18 things you should know about yourself! Click the X.
Genetics.
Applying Mendel’s Principles
11.2 – Applying Mendel’s Principles
Dihybrid cross Cross Involving 2 characteristics/ genes
Genetics.
Punnett Square Notes.
Predicting genetic outcomes
Heredity and Genetics Part Two Dihybrid Crosses
Heredity and Genetics Part Two Dihybrid Crosses
Mendel’s Dihybrid Cross
NOTES – Genetics: Independent Assortment & Dihybrid Crosses
Copyright Pearson Prentice Hall
Presentation transcript:

8.3 Continued… Studying Heredity Objectives Predict the results of dihybrid genetic crosses by using Punnett squares. Predict the results of dihybrid genetic crosses by using probabilities.

New Vocabulary Dihybrid Cross

Suppose a horticulturist has _______ characters to consider when crossing plants A cross that involves ________ pairs of contrasting traits is called a _______________ cross For example, a cross may be made between two pea plants that are heterozygous for seed __________ and seed ____________ two two dihybrid shape color

Pea plant seeds may be… round (R) or wrinkled (r) Yellow (Y) or green (y) So heterozygous parents will have the genotype __________ RrYy

RrYy The four possible gametes formed are… _____ _____ _____ _____ When forming gametes for a dihybrid cross, we must consider how the ______ alleles from either parent may ____________ and _____________ Example…so for an individual with the genotype RrYy, only ____ allele for each trait will be passed on in a gamete RrYy The four possible gametes formed are… _____ _____ _____ _____ four segregate combine one RY Ry rY ry

Imagine that a student incorrectly determined that one of the gametes contained the alleles Rr…why is this incorrect? The alleles for the same trait separate.. so you may only inherit one of each trait and not two!

Practice! Create the four possible gametes that an individual with each genotype may create… RrYY = _____ ______ _____ _____ Rryy = _____ _____ _____ ______ rrYY = _____ ______ ______ ______ RY RY rY rY Ry Ry ry ry rY rY rY rY

RY Ry rY ry RY RRYY RRYy RrYY RrYy Ry RRYy RRyy RrYy Rryy rY RrYY RrYy When two heterozygous pea plants (RrYy) are crossed, their gametes are written along the top and side of the Punnett square Then, the gametes ______________ in the individual boxes Phenotype ratio? RY RRYY RRYy RrYY RrYy Ry RRYy RRyy RrYy Rryy rY RrYY RrYy rrYY rrYy fuse ry RrYy Rryy rrYy rryy 9 round yellow : 3 round green : 3 wrinkled yellow : 1 wrinkled green

Short cut! 9:3:3:1 dominant second recessive-dominant recessive When individuals heterozygous for two traits are crossed, a Punnett square will always predict a __________ ratio in the offspring The numbers in the ratio are always listed in the following order… Both ________________ traits are listed first The dominant-recessive combo is listed ____________ The ________________________ combo is written third Both ________________ traits are written last 9:3:3:1 dominant second recessive-dominant recessive

Probability According to your ratio, what is the probability that an offspring from the cross will inherit round and yellow seeds? …round and green seeds? …wrinkled and yellow seeds? …wrinkled and green seeds? 9/16 3/16 3/16 1/16

Objective 1 Predict the results of dihybrid genetic crosses by using Punnett squares. Cross a pea plant that is homozygous dominant for seed shape but heterozygous for color ________ with one that is recessive for seed shape and color _________ Phenotype ratio? RY Ry RY Ry ry RrYy Rryy RrYy Rryy RRYy ry RrYy Rryy RrYy Rryy ry RrYy Rryy Rryy rryy RrYy ry RrYy Rryy RrYy Rryy 8 Round Yellow : 8 Round Green

Objective 2 Predict the results of dihybrid genetic crosses by using probabilities. In the previous cross what was the probability that an offspring will inherit round and yellow seeds? ….round and green seeds? …wrinkled and yellow seeds? 8/16 = 1/2 8/16 = 1/2 0/16