1. Sex linked traits are traits determined by genes on the X or Y chromosomes, mostly on the X chromosome as it contains more genes. 2. Sex linked traits are expressed differently in males and females since females have two X chromosomes and males have one X and one Y chromosome. 3. For X-linked conditions, only females can be carriers as males either express the trait or not, inherit the trait from their mother, and females cannot inherit an X-linked recessive trait from an unaffected father.

1. Sex linked traits
Ramya

2. Success Criteria
• Differentiate between X and Y chromosome
• Use Punnett square to solve problems related to sex linked diseases.

3. Lesson Outcome
Solve sex linked disease and analyze data to answer question.

4. Bellwork: Research differences between X and
Y chromosome

5. Sex linked traits

6. Draw a Punnett square to show cross
between and interpret the results
• XX and XY

7. • Sex linked genes are mostly located on X or Y chromosomes, but
mostly on X chromosome.
• Why?
• The Y chromosome is shorter than X chromoso e so it holds fewer
genes.

8. Define sex linked traits
• Traits that are not equally expressed in both sexes are sex-linked
traits.

10. • https://youtu.be/YXVyIDaUOD8?si=mROT5E10tYjkOlhI

11. X linked conditions
• The following trends always hold true for X-linked conditions:
• Only females can be carriers (a heterozygote for a recessive disease
condition), males cannot be heterozygous carriers
• Males will always inherit an X-linked trait from their mother (they inherit
a Y chromosome from their father)
• Females cannot inherit an X-linked recessive condition from an
unaffected father (must receive his dominant allele)

12. Rules for solving sex linked traits