Download BIOLOGY Chapter 10: Patterns of Inheritance Name: Section Goal

BIOLOGY
Chapter 10: Patterns of Inheritance
Name:________________________
Section Goal: The student will explain how sex-linked genes produce different inheritance patterns in males
and females and explain why most sex-linked disorders are more common in males.
Vocabulary:
1. Sex-linked gene
Concept 10.5: Sex-Linked traits have unique inheritance patterns
I. Sex-linked Genes
A. Many species have sex chromosomes, designated X and Y that are associated with determining an
individual’s sex XX= Female, while XY= Male
B. Any gene located on a sex chromosome is called a sex-linked gene
C. Sex-linked genes were discovered by Thomas Hunt Morgan while studying fruit flies
II. Sex-Linked Disorders
A. A number of human conditions, including red-green color blindness and hemophilia are inherited as
sex linked recessive traits
B. It takes two copies of the allele to be present in females for them to show signs of the disorder
while it only takes one in males
Lesson Reflection:
Complete Sex Linked Traits Worksheet
Lesson Assessment:
1. Describe why one would expect to find more white-eyed male fruit flies than white-eyed females in a
natural population.
2. A man with hemophilia and a homozygous non-hemophiliac woman have a son. Is it possible that the
son will inherit hemophilia? Why or why not?
Summary of Key concepts: Summary of Key Concepts for 10.5
Technology/Application/Connection to real-world: