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Life Science: Molecular Dihybrid Crosses

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Page 1: 1 Dihybrid Cross - Weebly · Dihybrid Cross n Hybrid is another way of saying heterozygous. A hybrid plant has one of each allele. n A plant that is heterozygous for two different

Life Science: MolecularDihybrid Crosses

Page 2: 1 Dihybrid Cross - Weebly · Dihybrid Cross n Hybrid is another way of saying heterozygous. A hybrid plant has one of each allele. n A plant that is heterozygous for two different

Second Law of Heredity

n By observing the inheritance patterns for two different traits Mendel proposed the second law of genetics the principle of independent assortment.

Page 3: 1 Dihybrid Cross - Weebly · Dihybrid Cross n Hybrid is another way of saying heterozygous. A hybrid plant has one of each allele. n A plant that is heterozygous for two different

Independent Assortment

Genes for different traits can segregate independently during the formation of gametes.

Page 4: 1 Dihybrid Cross - Weebly · Dihybrid Cross n Hybrid is another way of saying heterozygous. A hybrid plant has one of each allele. n A plant that is heterozygous for two different

n Each dominant trait is represented by a capital letter, ‘R’ for round, ‘Y’ for yellow.

n The recessive traits are represented by lower case letters, ‘r’ for wrinkled, ‘y’ for green, etc.

n When writing a genotype for two traits we use 4 letters, (e.g. RRYY)

RRYYRY

RY

Two-Factor Cross

RY

RY

Page 5: 1 Dihybrid Cross - Weebly · Dihybrid Cross n Hybrid is another way of saying heterozygous. A hybrid plant has one of each allele. n A plant that is heterozygous for two different

Two-Factor Cross: F1

Punnett Square:n A double homozygous

dominant male produces one type of gamete (RY).

RRYY

RY RY RY RY

rryy

Page 6: 1 Dihybrid Cross - Weebly · Dihybrid Cross n Hybrid is another way of saying heterozygous. A hybrid plant has one of each allele. n A plant that is heterozygous for two different

Two-Factor Cross: F1

Punnett Square:n A double homozygous

recessive female produces one type of gamete (ry).

RRYY rryy

ry ry ry ry

RY RY RY RY

Page 7: 1 Dihybrid Cross - Weebly · Dihybrid Cross n Hybrid is another way of saying heterozygous. A hybrid plant has one of each allele. n A plant that is heterozygous for two different

Two-Factor Cross: F1

Punnett Square:n All of the F1 individuals are

heterozygous for both traits.

ry

ry

ry

ry

RRYY rryy

RrYy RrYy RrYy RrYy

RrYy RrYy RrYy RrYy

RrYy RrYy RrYy RrYy

RrYy RrYy RrYy RrYy

RY RY RY RY

Page 8: 1 Dihybrid Cross - Weebly · Dihybrid Cross n Hybrid is another way of saying heterozygous. A hybrid plant has one of each allele. n A plant that is heterozygous for two different

Dihybrid Cross

n Hybrid is another way of saying heterozygous. A hybrid plant has one of each allele.

n A plant that is heterozygous for two different traits (e.g. RrYy) is called a double-heterozygote, or dihybrid.

Page 9: 1 Dihybrid Cross - Weebly · Dihybrid Cross n Hybrid is another way of saying heterozygous. A hybrid plant has one of each allele. n A plant that is heterozygous for two different

Two-Factor Cross: F2

RrYy

RY Ry rY ry

RrYyPunnett Square:n A double heterozygous

male produces four types of gametes (RY, Ry, rY, ry).

Page 10: 1 Dihybrid Cross - Weebly · Dihybrid Cross n Hybrid is another way of saying heterozygous. A hybrid plant has one of each allele. n A plant that is heterozygous for two different

Two-Factor Cross: F2

RY Ry rY ry

RY Ry rY ry

RrYy RrYyPunnett Square:n A double heterozygous

male produces four types of gametes (RY, Ry, rY, ry).

Page 11: 1 Dihybrid Cross - Weebly · Dihybrid Cross n Hybrid is another way of saying heterozygous. A hybrid plant has one of each allele. n A plant that is heterozygous for two different

Two-Factor Cross: F2

Punnett Square:n The dominant and

recessive traits appear in different combinations in the F2 generation.

RY

Ry

rY

ry

RRYY RRYy rRYY rRyY

RRYy RRyy rRYy rRyy

RrYY RryY rrYY rryY

RrYy Rryy rrYy rryy

RY Ry rY ry

RrYy RrYy

Page 12: 1 Dihybrid Cross - Weebly · Dihybrid Cross n Hybrid is another way of saying heterozygous. A hybrid plant has one of each allele. n A plant that is heterozygous for two different

Phenotypic Ratios

Pheno = Physical

n 9/16 Round & Yellow

RY

Ry

rY

ry

RRYY RRYy rRYY rRyY

RRYy RRyy rRYy rRyy

RrYY RryY rrYY rryY

RrYy Rryy rrYy rryy

RY Ry rY ry

RrYy RrYy

RY

Ry

rY

ry

RRYY RRYy rRYY rRyY

RRYy RRyy rRYy rRyy

RrYY RryY rrYY rryY

RrYy Rryy rrYy rryy

RY Ry rY ry

Page 13: 1 Dihybrid Cross - Weebly · Dihybrid Cross n Hybrid is another way of saying heterozygous. A hybrid plant has one of each allele. n A plant that is heterozygous for two different

Phenotypic Ratios

Pheno = Physical

n 9/16 Round & Yellown 3/16 Round & Green

RY

Ry

rY

ry

RRYY RRYy rRYY rRyY

RRYy RRyy rRYy rRyy

RrYY RryY rrYY rryY

RrYy Rryy rrYy rryy

RY Ry rY ry

RrYy RrYy

Page 14: 1 Dihybrid Cross - Weebly · Dihybrid Cross n Hybrid is another way of saying heterozygous. A hybrid plant has one of each allele. n A plant that is heterozygous for two different

Phenotypic Ratios

Pheno = Physical

n 9/16 Round & Yellown 3/16 Round & Greenn 3/16 Wrinkled & Yellow RY

Ry

rY

ry

RRYY RRYy rRYY rRyY

RRYy RRyy rRYy rRyy

RrYY RryY rrYY rryY

RrYy Rryy rrYy rryy

RY Ry rY ry

RrYy RrYy

Page 15: 1 Dihybrid Cross - Weebly · Dihybrid Cross n Hybrid is another way of saying heterozygous. A hybrid plant has one of each allele. n A plant that is heterozygous for two different

Phenotypic Ratios

Pheno = Physical

n 9/16 Round & Yellown 3/16 Round & Greenn 3/16 Wrinkled & Yellown 1/16 Wrinkled & Green

RY

Ry

rY

ry

RRYY RRYy rRYY rRyY

RRYy RRyy rRYy rRyy

RrYY RryY rrYY rryY

RrYy Rryy rrYy rryy

RY Ry rY ry

RrYy RrYy

Page 16: 1 Dihybrid Cross - Weebly · Dihybrid Cross n Hybrid is another way of saying heterozygous. A hybrid plant has one of each allele. n A plant that is heterozygous for two different

Phenotypic Ratios

n Mendel’s experimental results were very close to the 9:3:3:1 ratio that Punnett squares predict.

9 Round (dominant) and Yellow (dominant)

3 Round (dominant) and Green (recessive)

3 Wrinkled (recessive) and Yellow (dominant)

1 Wrinkled (recessive) and Green (recessive)


Dihybrid Punnett Squares

Monohybrid, Dihybrid, Trihybrid Problems

Dihybrid Crosses - Mercer Island School District · Setting up a Dihybrid Cross: RrYy x RrYy . Which is correct for a dihybrid cross of two heterozygous parents ... dihybrid crosses

Dihybrid inheritance. What is dihybrid inheritance? The study of genetic crosses involving two characteristics or two genes is called dihybrid inheritance

Genetics & The Work of Mendel - Main Home · of Mendelian Genetics. The student is expected to: ... • Cross pollination • Hybrid • Monohybrid • Dihybrid • Gene ... Complete

10.2 dihybrid crosses

1. Which is the correct set up for a dihybrid cross of two heterozygous parents RrYy x RrYy? See following slides:

Dihybrid Crosses

Genetics: Dihybrid Crosses

Dihybrid inheritance

Dihybrid Crosses

Monohybrid and Dihybrid

Ch02-2 dihybrid

14 Dihybrid Cross

Dihybrid cross

DIHYBRID CROSSES ( 2 traits)

Dihybrid Genetics

Monohybrid & Dihybrid Crosses

9- dihybrid Cross - WordPress.com...2017/04/09  · Dihybrid Crosses • Dihybrid Cross ~ genetic cross considering 2 gene traits at the same time, each consisting of nonidentical

Punnet Squares & Dihybrid Crosses

CLASS X - Extramarks · Monohybrid cross, dihybrid cross. The following terms to be covered: gene, allele, heterozygous, homozygous, dominant, recessive, mutation, variation, phenotype,

Revisiting Dihybrid Punnett Squares

Genetics Who do you look like????. Vocab Homozygous dominant/ homozygous recessive Heterozygous Genotype/ phenotype Gamete Hybrid Gene Segregation P

Meiosis in a Dihybrid

Dihybrid crosses and gene linkage

Genetics - Dihybrid Cross - MAC

An early dihybrid cross

Genetics - Dihybrid Cross

The correct set up for a heterozygous dihybrid cross is

jfriel.wikispaces.comBob+Genetics+Di... · Bikini Bottom — Dihybrid Practice Use the chart to identify the genotypes of the following traits: 1. Heterozygous round eyes, blue body

Genetics. Dihybrid Crosses Dihybrid crosses are the comparison of genetic makeup for two characteristics. EX: color and shape. Mendel used dihybrid crosses

 · A normal dihybrid cross between heterozygous ... Use the Sooty worksheet as you go through these slides. The 'colour' interactions are real, but the rest are

Catalyst – April 23, 2010 D = dimples, d = no dimples F = freckles, f = no freckles 1.Show the dihybrid cross for the following: Female - Heterozygous

Mendel’s Conclusions & Dihybrid crosses

Dihybrid (or greater) Crosses: Review