'Lethal alleles' presentation slideshows

neo-Mendelian Genetics

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1. Lethal alleles

1. Lethal alleles. 2. MULTIPLE ALLELES 3. PENETRANCE AND EXPRESSIVITY. Different dominant relationship. Two alleles with recessive lethal. Some alleles may cause lethality. Inheritance patterns in three crosses involving the

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Chapter 13: Extensions of Mendelian Principles : Multiple alleles

Chapter 13: Extensions of Mendelian Principles : Multiple alleles Modifications of dominance relationships Gene interactions Essential genes and lethal alleles Gene expression and the environment Epigenetics. Multiple alleles :

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Chapter 13: Extensions of Mendelian Principles : Multiple alleles

Chapter 13: Extensions of Mendelian Principles : Multiple alleles Modifications of dominance relationships Gene interactions Essential genes and lethal alleles Gene expression and the environment Epigenetics. Multiple alleles :

691 views • 35 slides

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GENE INTERACTIONS

GENE INTERACTIONS. Slide 2 Meiosis Slide 3 Crossing Over Slide 4 Mendel Slide 5 Punnet squares Slide 6 Bears Slide 7 Dihybrid Crosses Slide 8 Incomplete/Codominant Slide 9 Multiple Alleles and Lethal Genes Slide 10 Linked Genes. MEIOSIS. Meiosis is sex cell division.

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GENE INTERACTIONS

GENE INTERACTIONS. Slide 2 Meiosis Slide 3 Crossing Over Slide 4 Mendel Slide 5 Punnet squares Slide 6 Bears Slide 7 Dihybrid Crosses Slide 8 Incomplete/Codominant Slide 9 Multiple Alleles and Lethal Genes Slide 10 Linked Genes. MEIOSIS. Meiosis is sex cell division.

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Chromosome Alterations

Chromosome Alterations. Types of Chromosome. Chromosomes are placed into broad categories depending on the position of the centromere. metacentric : centromere in the middle, with arms of equal length. (A) telocentric : centromere at one end, with only 1 arm. (D)

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Extensions to Mendelism

Extensions to Mendelism. Mendel's pea experiments used a very simple genetic system: each gene had 2 alleles, one dominant and one recessive, and genes did not interact with each other.

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Study Questions. 1) Explain how a continuously variable trait could be governed by genes.

Study Questions. 1) Explain how a continuously variable trait could be governed by genes. Study Questions. 1) Explain how a continuously variable trait could be governed by genes.

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Revisions to Mendel

Revisions to Mendel. Some alleles are neither dominant or recessive, and many traits are controlled by multiple alleles or multiple genes. So special rules must be used for these cases. Incomplete dominance Codominance Multiple Alleles Lethal Alleles Sex Linked Inheritance Polygenic Traits.

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Variation and probability

Variation and probability. Gamete production is source of variation and genetic diversity, an advantage of sex. As a result of segregation and independent assortment, lots of combinations possible. 2 n possibilities exist for diploids where n = haploid number of chromosomes

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Lecture 14: Gene interactions

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