Non-Mendelian Genetics. It’s Complicated Many traits do not follow Mendel’s simple dominant/recessive rules Polygenic Trait: trait can be influenced by.

Slides:

Advertisements

Similar presentations

When Genetics is Not Simple

Advertisements

11-3 Exploring Mendelian Genetics

Booklet Project – Genetics Review

Incomplete dominance This is when neither allele is dominant.

Genetics Chapters 9-1 & 9-2. Incomplete dominance There is no dominant allele or recessive allele The 2 alleles are blended and make up a new physical.

Allele Genotype vs. Phenotype Flashcard Warm-up

Advanced Genetics.

Exceptions to Mendel’s laws. 1) Incomplete dominance Some alleles are not completely dominant and the offspring will have a “blending” of the parents.

Codominant vs Incomplete Dominant- What’s the difference?

Codominance and Sex-linked traits. CODOMINANCE 2 alleles are dominant and both are expressed Most common examples are blood type and flower color.

 Not all traits are simply inherited by dominant and recessive alleles (Mendelian Genetics). In some traits, neither allele is dominant or many alleles.

Take notes on the following slides on your foldable.

Unit 5 – Genetics Other forms of inheritance Not all traits are simply dominant or recessive, with only 2 possible alleles.

PATTERNS OF INHERITANCE. What type of inheritance pattern is represented?

HEREDITY: Going beyond Mendel Individuals don’t always follow the basic pattern of inheritance (dominant/recessive)

Beyond Mendel’s Laws of Inheritance

Genetics- the study of heredity. Heredity is the passing of characteristics from parent to offspring.

Can heredity follow different rules?

Exceptions to Mendel’s Principles: Incomplete Dominance Codominance Multiple Alleles Sex -Linked Disorders.

WHEN HEREDITY FOLLOWS DIFFERENT RULES

Ch. 10.3: Exceptions to Mendel’s Rules of Inheritance Objectives: 1.Describe how alleles interact in intermediate inheritance. 2.Describe inheritance patterns.

Variations to Inheritance Exceptions to Mendel’s Laws.

Genetics. Incomplete Dominance Where neither the dominant or recessive allele is truly dominant over the other, both are dominant.

Bellringer (Week 3). Bellringer cont. Section 12-2 When Heredity Follows Different Rules.

Incomplete Dominance & Codominance Section 11-3 in Book.

Mendelian Inheritance

REVIEW GENETICS- the study of heredity. Inheritance Traits are specific characteristics inherited from parents Genes are the factors that determine traits.

COMPLEX PATTERNS OF HEREDITY Polygenic Traits: traits influenced by several genes ex: human eye color, height, weight, hair color.

Non-Mendelian Genetics BECAUSE SOME TRAITS DON’T FOLLOW THE SIMPLE DOMINANT/RECESSIVE RULES THAT MENDEL FIRST APPLIED TO GENETICS.

SPECIAL TYPES OF CROSSES

Warm Up Who is Gregor Mendel? What’s the difference between “true breeds” and “hybrids”? Explain his experimentations and their impact in genetics.

Co-Dominant and Sex-Linked Traits NOTES. I. Co-Dominant Genetic Traits All alleles for a trait are DOMINANT and both appear in offspring Different capital.

Unit 5 – Genetics Other forms of inheritance Not all traits are simply dominant or recessive, with only 2 possible alleles.

Genes that are located on the sex chromosomes are sex-linked genes. In mammals, individuals with two X chromosomes, an XX genotype, are females. Individuals.

Incomplete and Codominance. Simple Inheritance Mendel studied simple patterns of inheritance. Mendel studied simple patterns of inheritance. Found that.

Exceptions to Mendel’s laws Variations in Genetics.

 Not all traits are simply inherited by dominant and recessive alleles (Mendelian Genetics). In some traits, neither allele is dominant or many alleles.

Complex Patterns of Inheritance There are some exceptions to Mendel’s Laws.

Do all genetic traits follow the rules of dominance & recessiveness?

Patterns of Inheritance

Karyotyping BSC 2010L.

Exceptions to Mendel’s laws

Blood Group Notes.

Non-Mendelian Genetics

Complex Patterns of Inheritance

Non Mendelian Genetics Foldable

Complex Patterns of Inheritance

Non-Mendelian Genetics

Biology Unit 5 Notes: NON-Mendelian Genetics

Patterns of Inheritance

Understanding Inheritance

Punnett Squares: Part 2.

Complex Patterns of Inheritance

Complex Patterns of Inheritance

Exceptions to Mendel’s laws

Modes of inheritance There are more modes of inheritance than simple dominant-recessive with only 2 alleles.

COMPLEX PATTERNS OF HEREDITY

Complicated GENETIC Punnett Squares

Gene Expression/ Inheritance Patterns

Complex Patterns of Inheritance

Variations on Mendel’s Themes

Exceptions to Mendel’s Rule

Special Inheritance Patterns

Unit 6 Notes: Non-Mendelian

Non-Mendelian Genetics

Complete Incomplete Codominance Multiple Alleles Sex-linked Traits

Non Mendelian Genetics

Presentation transcript:

Non-Mendelian Genetics

It’s Complicated Many traits do not follow Mendel’s simple dominant/recessive rules Polygenic Trait: trait can be influenced by several genes Genes may be on the same or different chromosomes Incomplete Dominance: phenotype displays a trait that is a blend of the two parents Multiple Alleles: gene has three or more versions Ex: Blood Type Codominance: two dominant alleles are expressed at the same time Sex-linked traits Environmental Factors

Polygenic trait Two or more genes effect the phenotype Ex: Eye color, height, weight, skin color

Incomplete Dominance Offspring’s phenotype is a blend of the parental phenotypes. Notation: all alleles are written as capital letters, however a different letter is used to represent the different alleles Ex: Red (RR), White (WW) parents would make Pink (RW) offspring RR WRW W

Multiple Alleles Genes has three or more alleles Ex: Human blood has three alleles I A, I B, and i Produces 4 blood types, A, B, AB, and O The A, B alleles control the production of a specific sugar on red blood cells The i allele causes the cell to produce no sugar on the surface

Multiple Alleles

Codominance Two dominant alleles are expressed at the same time Typically produces a spotted appearance Ex: AB blood type – Both the A and B sugar is present on the surface of a red blood cell Spotted Flowers FBFB FBFB FWFW FBFWFBFW FBFWFBFW FWFW FBFWFBFW FBFWFBFW

Sex-linked traits Trait whose allele is located on the sex chromosome Most are on the X chromosome Typically, will only see the recessive allele in males Females that are heterozygous are considered “carriers” Most negative sex-linked traits are recessive Y Linked traits typically are not passed on because they cause sterility Ex: Color Blindness, Hemophilia

Sex-linked traits XBXB Y XBXB XBXBXBXB XBYXBY XbXb XBXbXBXb XbYXbY

Environmental Factors Can change the phenotype of an organism Typically is based on factors such as temperature, radiation, or acidity Ex Human Skin Color Certain flowers’ color Arctic Fox Coat (white in winter, brown is summer)