Respuesta :

ajeigbeibraheem

Answer:

The affected Female is [tex]X^AX^A[/tex]  and the male that is unaffected to be [tex]XY[/tex]

Explanation:

From the diagram attached below shows the table of the cross performed and the phenotypes of the resulting offspring.

We are to Identify the genotypes of the male and female flies used in cross 2.

To do that:

In the cross 2; we have the following :

Phenotypes of females used in the cross  = affected

Phenotypes of males used in the cross = unaffected

Percent of the total population that are affected = 50

Percent of the male offspring that are affected = 100

Percent of the female offspring that are affected = 0

We knew that for a female chromosome (XX) to be affected that disease must be expressed on both allele of the female chromosome and for a male chromosome to be affected it need to be expressed on only one of the allele in the XY chromosome.

From the cross 2 given; it was stated that the female used in the cross is affected ; so we have:

The affected Female  to be  [tex]X^AX^A[/tex]  and the male that is unaffected to be [tex]XY[/tex]

Let have the cross to see if it correlates and test the validity of the result given in cross 2 :

SO ;if [tex]X^AX^A[/tex]  crosses with [tex]XY[/tex]; we have :

                [tex]X^A[/tex]               [tex]X^A[/tex]

[tex]X[/tex]              [tex]X^AX[/tex]            [tex]X^AX[/tex]

[tex]Y[/tex]               [tex]X^AY[/tex]            [tex]X^AY[/tex]

The genotypic ratio for the unaffected female offspring is : ([tex]X^AX[/tex] , [tex]X^AX[/tex]) which is only half(1/2) of the total offspring.

We will see that the percentage of the total population that are unaffected = 50%

The percentage of male offspring that were affected are ( [tex]X^AY[/tex] and  [tex]X^AY[/tex])= 100% of the population.

Ver imagen ajeigbeibraheem

Drosophila flies that are extensively used for genetic studies and research. In the data given, the affected female will have a genotype [tex]\text\text{X}^A\text{X}^A[/tex] and unaffected males will be XY.

For the given data, we have:

Cross 2:

  • Phenotypes of females used in the cross = affected
  • Phenotypes of males used in the cross = unaffected
  • Percent of the total population affected = 50 %
  • Percentage of the male offspring affected = 100 %
  • Percentage of the female offspring affected = 0 %

Now,

The females have XX chromosomes, and to be affected the females must have both copies of the affected gene.

For males, the allele should be expressed in one of the chromosomes.

Let the affected genotype of females be[tex]\text{X}^A\text{X}^A[/tex] and unaffected males are XY. The cross between affected females and unaffected [tex]\text{X}^A\text{X}^A[/tex] males is given below in the attachment.

The genotypic ratio for the unaffected female offspring is half of the total offspring.

The percentage of the total population that is unaffected = 50%

The percentage of male offspring that were affected = 100% of the population.

Find the table for a cross below in the attachment.

To know more about the Drosophila cross, refer to the following link:

https://brainly.com/question/16380678

Ver imagen kasliwalalvi24
Ver imagen kasliwalalvi24

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