7.1 Chromosomes and Phenotype KEY CONCEPT The chromosomes on which genes are located can affect the expression of traits.

Slides:

Advertisements

Similar presentations

Mendel’s Laws of Heredity

Advertisements

7.1 Chromosomes and Phenotype

Two copies of each autosomal gene affect phenotype.

Two copies of each autosomal gene affect phenotype.

Please make a list of your observable traits. Be specific.

Two copies of each autosomal gene affect phenotype.

KEY CONCEPT Phenotype is affected by many different factors.

13.1 Ecologists Study Relationships Unit 3: Genetics Chapter 7 Extending Mendelian Genetics Section 7-1 Chromosomes and Phenotype.

 Genes are found on the X AND Y chromosomes.  Genes that are carried on the sex chromosomes are called sex linked genes.

Chromosomal Basis of Inheritance Chapter 15. Objectives Be familiar with patterns of inheritance for autosomal and sex linked genes Understand the concept.

Pedigree Analysis.

Pedigrees A pedigree is a diagram of family relationships that uses symbols to represent people and lines to represent genetic relationships. In a pedigree,

7.1 Chromosomes and Phenotype KEY CONCEPT The chromosomes on which genes are located can affect the expression of traits.

Sex-Linked Inheritance

7.1 Chromosomes and Phenotype: Autosomal Genetic Disorders

Genetics Continued. Genetic variation The major advantage of sexual reproduction is that it creates genetic variation within a species. We have 23 pairs.

Sex Linkage and Polygenic Traits [11.2] SPI 4 Determine the probability of a particular trait in an offspring based on the genotype of the parents and.

1 Human Genetics: Pedigrees. Pedigree Looks at family history and how a trait is inherited over several generations and can help predict inheritance patterns.

7.4 Human Genetics and Pedigrees Bell Work. 7.4 Human Genetics and Pedigrees Bell Work.

7.1 Chromosomes and Phenotype KEY CONCEPT The chromosomes on which genes are located can affect the expression of traits.

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.

7.1 Chromosomes and Phenotype KEY CONCEPT The chromosomes on which genes are located can affect the expression of traits.

Sex-Linked Traits. Inheritance of Traits  X-linked Disorders - occur mainly in males because the mother usually donates the recessive allele and males.

Sex Linked Inheritance

7.1 Chromosomes and Phenotype

Two copies of each autosomal gene affect phenotype.

7.1 Chromosome and Phenotype

Two copies of each autosomal gene affect phenotype.

Two copies of each autosomal gene affect phenotype.

KEY CONCEPT A combination of methods is used to study human genetics.

Objectives Students will be able to: Relate dominant-recessive patterns of inheritance in autosomal chromosomes to genetic disorders. Describe patterns.

Two copies of each autosomal gene affect phenotype.

Blood Group Notes.

Biology Unit Four C – Chromosomes and Phenotype

Section 7-1 “Human genetics”

Two copies of each autosomal gene affect phenotype.

Two copies of each autosomal gene affect phenotype.

Mendel’s Genetics Chapter 7.

Two copies of each autosomal gene affect phenotype.

Two copies of each autosomal gene affect phenotype.

Objectives Relate dominant-recessive patterns of inheritance in autosomal chromosomes to genetic disorders. Describe patterns of inheritance in sex-linked.

Two copies of each autosomal gene affect phenotype.

Sexually reproducing organisms have two of each chromosome.

Mendel’s Laws of Heredity-Why we look the way we look...

Two copies of each autosomal gene affect phenotype.

Sex Linked Genes.

Two copies of each autosomal gene affect phenotype.

Two copies of each autosomal gene affect phenotype.

Patterns of Inheritance

KEY CONCEPT A combination of methods is used to study human genetics.

Two copies of each autosomal gene affect phenotype.

Sex Linked Inheritance

Two copies of each autosomal gene affect phenotype.

Two copies of each autosomal gene affect phenotype.

Two copies of each autosomal gene affect phenotype.

Two copies of each autosomal gene affect phenotype.

Two copies of each autosomal gene affect phenotype.

S3: HEREDITY E1: SEX-LINKED TRAITS

Two copies of each autosomal gene affect phenotype.

Two copies of each autosomal gene affect phenotype.

7.1 Chromosomes and Phenotype

Sex-Linked Inheritance

Complex Patterns of Inheritance

Two copies of each autosomal gene affect phenotype.

Carrier = an organism that has inherited a genetic trait or mutation, but displays no symptoms X-linked traits = traits that are passed on from parents.

Two copies of each autosomal gene affect phenotype.

Two copies of each autosomal gene affect phenotype.

Two copies of each autosomal gene affect phenotype.

Two copies of each autosomal gene affect phenotype.

Presentation transcript:

7.1 Chromosomes and Phenotype KEY CONCEPT The chromosomes on which genes are located can affect the expression of traits.

7.1 Chromosomes and Phenotype Two copies of each autosomal gene affect phenotype. Mendel studied autosomal gene traits, like hair texture.

7.1 Chromosomes and Phenotype Mendel’s rules of inheritance apply to autosomal genetic disorders. –A heterozygote for a recessive disorder is a carrier. –Disorders caused by dominant alleles are uncommon. (dominant)

7.1 Chromosomes and Phenotype Work the following problem: Two parents, who both know their genotype, are carriers for albinism. They are both heterozygous. What is the chance that their children have albinism?

7.1 Chromosomes and Phenotype Work the following problem: Huntington’s disease is a rare, but not uncommon, disease that is caused by a dominant allele. Suppose that two parents are crossed one that is heterozygous for Huntington’s and one that is homozygous recessive. What is the chance that their offspring will have Huntington’s disease?

7.1 Chromosomes and Phenotype Males and females can differ in sex-linked traits. Genes on sex chromosomes are called sex-linked genes. –Y chromosome genes in mammals are responsible for male characteristics. –X chromosome genes in mammals affect many traits.

7.1 Chromosomes and Phenotype A male (XX) and a female (XY) mate – what is the chance that they have a male offspring?

7.1 Chromosomes and Phenotype Weird combinations have happened….. Any combination (up to XXXXY) produces maleness. Males with more than one X are usually underdeveloped and sterile. XXX and XO women are known, although in most cases they are sterile.

7.1 Chromosomes and Phenotype

Male mammals have an XY genotype. –All of a male’s sex- linked genes are expressed. –Males have no second copies of sex-linked genes.

7.1 Chromosomes and Phenotype Female mammals have an XX genotype. –Expression of sex-linked genes is similar to autosomal genes in females. –X chromosome inactivation randomly “turns off” one X chromosome.