Presentation is loading. Please wait.

Presentation is loading. Please wait.

Dihybrid cross Used when looking at inheritance patterns of 2 genes on different chromosomes Independent assortment will separate the 2 homologous chromosomes.

Published byMargaret Caldwell Modified over 6 years ago

Similar presentations

Presentation on theme: "Dihybrid cross Used when looking at inheritance patterns of 2 genes on different chromosomes Independent assortment will separate the 2 homologous chromosomes."— Presentation transcript:

1 Dihybrid cross Used when looking at inheritance patterns of 2 genes on different chromosomes Independent assortment will separate the 2 homologous chromosomes independently from each other Because of this, you must find the probability that each allele on each chromosome will combine with the other alleles

2 How? Lets cross 2 hybrid tall hybrid green peas with each other.
Determine the genotype of these seeds

3 TtGg x TtGg

4 TtGg x TtGg The “T” has an equal chance of combining with the G or g
Likewise the “t” has an equal chance Therefore we must show this in the Punnett square

5 TtGg x TtGg TtGg TG

6 TtGg x TtGg TtGg TG Tg

7 TtGg x TtGg TtGg TG Tg tG

8 TtGg x TtGg TtGg TG Tg tG tg

9 TtGg x TtGg TG Tg tG tg Do the same for the other pair of chromosomes
down the side TG Tg tG tg

10 TtGg x TtGg Fill in the squares as before TG Tg tG tg TG TTGG Tg tG tg

11 TtGg x TtGg Determine phenotypes TG Tg tG tg TG TTGG TTGg TtGG TtGg Tg

12 TG Tg tG tg TG TTGG TTGg TtGG TtGg Tg TTGg TTgg TtGg Ttgg tG TtGG TtGg ttGG ttGg tg TtGg Ttgg ttGg ttgg T?G? = tall green T?gg = tall yellow ttG? = short green ttgg = short yellow

13 TG Tg tG tg TG TTGG TTGg TtGG TtGg Tg TTGg TTgg TtGg Ttgg tG TtGG TtGg ttGG ttGg tg TtGg Ttgg ttGg ttgg T?G? = tall green 9 T?gg = tall yellow 3 ttG? = short green 3 ttgg = short yellow 1

14 Cross a hybrid tall hybrid green pea plant with a short yellow plant

15 Cross a hybrid tall hybrid green pea plant with a short yellow plant
TtGg x ttgg

16 Cross a hybrid tall hybrid green pea plant with a short yellow plant
TtGg x ttgg TG Tg tG tg tg tg tg tg

17 Cross a hybrid tall hybrid green pea plant with a short yellow plant
TtGg x ttgg TG Tg tG tg TtGg Ttgg ttGg ttgg tg TtGg Ttgg ttGg ttgg tg tg TtGg Ttgg ttGg ttgg tg TtGg Ttgg ttGg ttgg

18 TG Tg tG tg TtGg Ttgg ttGg ttgg tg TtGg Ttgg ttGg ttgg tg tg TtGg Ttgg ttGg ttgg tg TtGg Ttgg ttGg ttgg T?G? = tall green T?gg = tall yellow ttG? = short green ttgg = short yellow

19 TG Tg tG tg TtGg Ttgg ttGg ttgg tg TtGg Ttgg ttGg ttgg tg tg TtGg Ttgg ttGg ttgg tg TtGg Ttgg ttGg ttgg T?G? = tall green 1 T?gg = tall yellow 1 ttG? = short green 1 ttgg = short yellow 1

Download ppt "Dihybrid cross Used when looking at inheritance patterns of 2 genes on different chromosomes Independent assortment will separate the 2 homologous chromosomes."

Similar presentations

The Law of Independent Assortment

The Law of Independent Assortment
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.

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.
Dihybrid Cross. What is Dihybrid Cross? When we study two traits on different chromosomes, at one time, we call this a dihybrid cross. You still follow.

Dihybrid Cross. What is Dihybrid Cross? When we study two traits on different chromosomes, at one time, we call this a dihybrid cross. You still follow.
Monohybrid & Dihybrid Crosses

Monohybrid & Dihybrid Crosses
Punnett Squares Step by step how to guide. Putting it together Alleles represented by letters –Capital letters = dominant (T) –Lowercase letters = recessive.

Punnett Squares Step by step how to guide. Putting it together Alleles represented by letters –Capital letters = dominant (T) –Lowercase letters = recessive.
So I am looking at 2 characters how many traits am I studying? I WANT PURPLE FLOWERED, YELLOW- SEEDED PEA PLANTS.

So I am looking at 2 characters how many traits am I studying? I WANT PURPLE FLOWERED, YELLOW- SEEDED PEA PLANTS.
Genetics.

Genetics.
What is genetics? GENETICS is the branch of Biology that studies heredity. HEREDITY is… the passing on of characteristics from parents to offspring. Mendelian.

What is genetics? GENETICS is the branch of Biology that studies heredity. HEREDITY is… the passing on of characteristics from parents to offspring. Mendelian.
Genetics Chapter 11.

Genetics Chapter 11.
Applying Mendel’s Principles Probability, Punnett Squares, & Independent Assortment (Dihybrid Cross) Section 11.2.

Applying Mendel’s Principles Probability, Punnett Squares, & Independent Assortment (Dihybrid Cross) Section 11.2.
Meiosis, Genetics, & Probability Biology. How are meiosis & genetics related? 1. Meiosis produces gamete cells.

Meiosis, Genetics, & Probability Biology. How are meiosis & genetics related? 1. Meiosis produces gamete cells.
Phenotypes and Genotypes Mendel’s experiments showed that “yellow” pea plants are not all the same. Two organisms can look alike but have different gene.

Phenotypes and Genotypes Mendel’s experiments showed that “yellow” pea plants are not all the same. Two organisms can look alike but have different gene.
What is genetics? G ENETICS is the branch of Biology that studies heredity. H EREDITY is… the passing on of characteristics from parents to offspring.

What is genetics? G ENETICS is the branch of Biology that studies heredity. H EREDITY is… the passing on of characteristics from parents to offspring.
11.2 Applying Mendel’s Principles

11.2 Applying Mendel’s Principles
Crosses Involving more than one gene Dihybrid and Polyhybrid Crosses.

Crosses Involving more than one gene Dihybrid and Polyhybrid Crosses.
DIHYBRID CROSSES ( 2 traits)

DIHYBRID CROSSES ( 2 traits)
GENETICS Medelian Genetics Gregor Mendel 1800’s.

GENETICS Medelian Genetics Gregor Mendel 1800’s.
The Work of Gregor Mendel. Essential Question:  Describe Mendel’s studies and conclusions about inheritance. 

The Work of Gregor Mendel. Essential Question:  Describe Mendel’s studies and conclusions about inheritance. 
Mendel’s Theory Section 2. Explaining Mendel’s Results Mendelian theory of heredity explains simple patterns of inheritance. In these patterns, two of.

Mendel’s Theory Section 2. Explaining Mendel’s Results Mendelian theory of heredity explains simple patterns of inheritance. In these patterns, two of.
Objective: What is the purpose of a test- cross in genetics? Do Now: Black hair: B Blonde hair: b What would the gene combination look like for someone.

Objective: What is the purpose of a test- cross in genetics? Do Now: Black hair: B Blonde hair: b What would the gene combination look like for someone.

Similar presentations

Ads by Google