Sex-linked traits

Presentation

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Biology, Science

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10th Grade

•

Medium

•

NGSS

HS-LS3-2, HS-LS3-1, HS-LS3-3

Standards-aligned

Dennis Yanga

Used 202+ times

FREE Resource

11 Slides • 5 Questions

Sex-linked traits

The human karyotype. http://fig.cox.miami.edu/

Inheritance of sex

The male's sperm determines the sex of the offspring
The sex chromosomes carry genes related to sexual development (e.g. sex organs, position of fat stores)

Sex-linked traits

Sex chromosomes also carry genes not related to sex
Examples are hemophilia and color blindness
These characteristics are "sex-linked"

Color blindness

person has difficulty seeing colors

Hemophilia

person cannot easily form blood clots
person has a high risk of losing blood, even from bruises

Cross between parents who are both carriers of hemophilia

Multiple Choice

What is the inheritance of color blindness an example of?

co-dominance

continuous variation

karyotype cross

sex linkage

Multiple Choice

For haemophilia, let H be the normal allele and h the mutant allele.

Which is the genotype of the unaffected male?

X^hY

X^HX^H

X^HX^h

X^HY

Multiple Select

Which of the following explains why color blindness is more common in males? Tick two.

The mutant allele for color blindness is carried by the X chromosome.

The mutant allele for color blindness is carried by the Y chromosome.

Male has only one X chromosome, so either allele is expressed.

Female has two X chromosomes, so either allele is expressed.

Fill in the Blanks

Type answer...

Multiple Choice

The diagram shows the sex chromosomes of a woman and of a man. Their genotypes for a recessive sex-linked condition are also shown.

What are the chances that their daughter will show the sex-linked condition?

25%

50%

75%

Sex-linked traits

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