In humans, hemophilia is caused by a recessive allele on the x chromosome. suppose a man with hemophilia has children with a healthy woman whose mother had hemophilia. what is the probability that their second child will have hemophilia? (enter the probability as a percent. enter the number only without the percent sign. for example, enter 100% as 100 and enter 12.5% as 12.5)

The answer is 50

Explanation:

Hemophilia is a X-linked disease. That means the recesive allele which causes the disease is not in Y chromosome, but only in X chromosome.  If we denote:

X⁺ : dominant allele

X⁻: recesive allele

Then, in a woman there are three posibilities:

X⁺X⁻: is a carrier woman (without hemophilia)

X⁺X⁺: healthy woman

X⁻X⁻: woman with hemophilia

But in a man there are two posibilities:

X⁺Y: healthy man

X⁻Y: man with hemophilia

A man with hemophilia is X⁻Y, and a healthy woman whose mother had hemophilia is a carrier woman (X⁺X⁻). If they have a child, there are 4 posibilities, and each one has 1/4 of occurrence probability:

X⁻Y  x  X⁺X⁻ = X⁻X⁺, X⁻X⁻, X⁺Y, YX⁻

Posibilities with hemophilia are X⁻X⁻ and YX⁻ (1/4 + 1/4= 1/2= 0.5= 50%)

In each filial, there is a 50 percent of probability of having a child (man or woman) with hemophilia.

explanation:

codominace both parental allels can be observed in the offspring

dominance neither parental allels can be observed in the offspring

the answer is admiramos

the rule for verbs is whoever you are referring to (in this case 'nosotros'), you need to change the ending of the word.

nosotros - amos

yo - o

tu - as

el, ella, usted - a

ellos, ellas, ustedes - an

(examples: nosotros bailamos (instead of bailar) or yo hablo (instead of habla)