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Do Now. Complete a punnett square showing the cross between a heterozygous tall plant and a homozygous recessive plant . . Announcements. Gonzaga is now ranked Quiz on Thursday I will not be here on Friday. . Agenda. Sex linked traits Sex linked punnett squares

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Presentation Transcript
do now

Do Now

Complete a punnett square showing the cross between a heterozygous tall plant and a homozygous recessive plant .

announcements

Announcements

Gonzaga is now ranked

Quiz on Thursday

I will not be here on Friday.

agenda

Agenda

Sex linked traits

Sex linked punnett squares

Article detailing sex linked traits

sex linked traits

Sex Linked traits

Sex linked traits are those traits that are found on either the X or Y chromosome.

hemophilia

Hemophilia

Hemophilia is a disease where your blood doesn’t clot.

It only occurs when all of the X chromosomes have a copy of the recessive gene.

sex linked trait example

Sex Linked trait example

XHXh: Female Carrier

XhXh: Female Hemophiliac

XHY: Normal Male

XhY: Hemophiliac Male

sex linked trait punnett square

Sex Linked trait Punnett Square

As we’re watching this video, let’s copy this professor’s example in our notes.

http://www.youtube.com/watch?v=j35OALtS3Bk

example

Example

Colorblindness is inherited as a sex-linked recessive disease. An affected male marries a heterozygous female. Draw a Punnett square of the possible offspring. What is the chance that they will have an affected child? Could any of their daughters be affected?

example1

Example

Colorblindness is inherited as a sex-linked recessive disease.

1. Recognize how the disease in inherited.

a. Sex-linked means that the gene is carried on the X chromosome.

b. Recessive means that both alleles must be recessive for female to have the disease. Females could have a good backup copy because they have two X chromosomes.

c. Males, who only have one X chromosome, will have the disease if their only X is mutant.

example2

Example

An affected male marries a heterozygous female.

2. Determine the genotypes of the parents.

Affected male is XA Y(since he is affected, his only X is mutant)

Heterozygous female is XA X(heterozygous means one of each allele)

example3

Example

Draw a Punnett square of the possible offspring.

3. Set up the Punnett square with the genotypes of the above two parents.

example4

Example

What is the chance that they will have an affected child?

4. Determine how many possibles would be affected according to how the disease in inherited (See help #1).