S3: HEREDITY E1: SEX-LINKED TRAITS

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Presentation transcript:

S3: HEREDITY E1: SEX-LINKED TRAITS Objective: Explain how autosomal and sex chromosomes genes affect phenotypes differently. GRAB YOUR NOTEBOOK. ANNOTATE AND WRITE YOUR CER PARAGRAPH ABOUT THE ARTICLE IN YOUR NOTEBOOK.

I. CHROMOSOMES AND PHENOTYPES

I. CHROMOSOMES AND PHENOTYPES Two copies of each autosomal gene affect phenotype

I. CHROMOSOMES AND PHENOTYPES Two copies of each autosomal gene affect phenotype Autosomes are chromosomes 1-22

I. CHROMOSOMES AND PHENOTYPES Two copies of each autosomal gene affect phenotype Autosomes are chromosomes 1-22 A human has 22 pairs of autosomes

I. CHROMOSOMES AND PHENOTYPES Two copies of each autosomal gene affect phenotype Autosomes are chromosomes 1-22 A human has 22 pairs of autosomes Autosomes DO NOT affect gender

2. People can be carriers for a disease

2. People can be carriers for a disease A heterozygote for a recessive disorder is a carrier

2. People can be carriers for a disease A heterozygote for a recessive disorder is a carrier

2. People can be carriers for a disease A heterozygote for a recessive disorder is a carrier Dominant allele disorders are uncommon

B. Males and females differ in sex-linked traits

B. Males and females differ in sex-linked traits 1. Genes on sex chromosomes are called sex-linked genes

B. Males and females differ in sex-linked traits 1. Genes on sex chromosomes are called sex-linked genes Y chromosome genes in mammals are responsible for male characteristics

B. Males and females differ in sex-linked traits 1. Genes on sex chromosomes are called sex-linked genes Y chromosome genes in mammals are responsible for male characteristics X chromosome genes are important in mammals

B. Males and females differ in sex-linked traits 1. Genes on sex chromosomes are called sex-linked genes Y chromosome genes in mammals are responsible for male characteristics X chromosome genes are important in mammals

2. Male mammals have an XY genotype

2. Male mammals have an XY genotype All of a male’s sex linked genes are expressed

3. Female mammals have an XX genotype

3. Female mammals have an XX genotype Expression of sex-linked genes is similar to autosomal genes in females since they have two copies

SEX-LINKED INHERITANCE ACTIVITY WORKING WITH YOUR PARTNER READ AND COMPLETE THE SEX- LINKED INHERITANCE ACTIVITY

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