'Recessive allele' diaporamas de présentation

Chapter 9 : Patterns of Inheritance

Chapter 9 : Patterns of Inheritance. B iology and Society: Our Longest-Running Genetic Experiment: Dogs. People have selected and mated dogs with preferred traits for more than 15,000 years.

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BEYOND DOMINANT & RECESSIVE ALLELES

INCOMPLETE DOMINANCE, CODOMINANCE, MULTIPLE ALLELES, POLYGENIC TRAITS. BEYOND DOMINANT & RECESSIVE ALLELES. DOMINANT? RECESSIVE? NEITHER?.

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Mendelian Genetics

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Genetic Traits

Genetic Traits. Earlobe Attachment. Some scientists have reported that this trait is due to a single gene for which unattached earlobes is dominant and an attached earlobe is recessive. Other scientists have reported that this trait is probably due to several genes. Thumb Extension.

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Linkage Mapping

Linkage Mapping. Physical basis of linkage mapping Mapping by the 2-factor testcross method Mapping by the 3-factor testcross method. A. Physical Basis. If two genes are located on the same chromosome, their alleles can recombine only when there is crossing over during meiosis

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Notes: Genetics and Heredity

Notes: Genetics and Heredity. Sci.7.10A & Sci.7.10C. What is Heredity?. Heredity is the passing along of traits from parent to offspring or children. Traits are the physical characteristics that an organism contains. Example-hair color, eye color, hair texture

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Introduction to Cystic Fibrosis

Introduction to Cystic Fibrosis. Single gene Mendelian disorder Gene codes for the Cystic Fibrosis Transmembrane Conductance Regulator protein (CFTR). CFTR. Transmembrane Cl - channel protein Gene located on human chromosome seven More than 1400 alleles with diminished function

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Complex Genetic Principles & Human Genetics

Complex Genetic Principles & Human Genetics. When Heredity Follows Different Rules. Incomplete Dominance Co-dominance Multiple Alleles Sex Linkage Polygenic Inheritance. Incomplete Dominance & Codominance. There is no dominant allele, There is no recessive allele.

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Gregor Mendel

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Sex-linked Inheritance

Sex-linked Inheritance. Sex chromosomes determine gender XX : female XY: male In humans the X chromosome is much larger than the Y chromosome and contains thousands of more genes Very little homologous DNA X chromosomes are responsible for many non-sexual traits.

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What is Hereditary?

What is Hereditary?. Vocabulary. Hereditary: passing physical characteristics from parent to offspring Trait: specific characteristic Genetics: scientific study hereditary Fertilization: new organism forms when egg, sperm cells join

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Mendelian Inheritance

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Human Inheritance

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Inbreeding and Outbreeding

Inbreeding and Outbreeding. Inbreeding. Occurs when close relations bred together. Used by breeder to reinforce desirable characteristics. Can increase the likely hood that an individual might inherit 2 copies of a recessive allele. Therefore recessive genetic diseases are more likely.

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KEY CONCEPT Genes encode proteins that produce a diverse range of traits.

KEY CONCEPT Genes encode proteins that produce a diverse range of traits. The same gene can have many versions. . A gene is a piece of DNA that directs a cell to make a certain protein. Each gene has a locus, a specific position on a pair of homologous chromosomes.

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Deducing Genotypes

Deducing Genotypes. Song Hee Bae IB1 Biology. Pedigree Charts. How a trait can pass Whether dominant or recessive Whether sex-linked or not Sex-linkage Ex) color blindness, hemophilia Similar to family tree Squares = male Circles = female Shaded = affected Not shaded = unaffected.

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1) If there are two alleles at a locus, and one of them has a frequency of 0.4

1) If there are two alleles at a locus, and one of them has a frequency of 0.4. A) The other has a frequency of 0.6 B) Heterozygote frequency would be 0.48 assuming Hardy-Weinberg conditions C) The homozygous recessive genotype frequency would be 0.36 (assuming H-W) D) All of the above

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Polydactyly

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Dragonfly eye colour Christina Khoo and Selvi Nair

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