1. 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.

2. I. CHROMOSOMES AND PHENOTYPES

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

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

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

6. 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

7. 2. People can be carriers for a disease

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

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

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

11. B. Males and females differ in sex-linked traits

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

13. 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

14. 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

15. 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

16. 2. Male mammals have an XY genotype

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

18. 3. Female mammals have an XX genotype

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

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