Individuals III-3 and III-4 are expecting their first child when they become aware that they both have a family history of this
recessive condition. As their genetic counselor, you can calculate the probability that they are carriers and that their child will be affected with the condition.
1.) The probability that III- 3 is a carrier (Rr) =
2.) The probability that III - 4 is a carrier (Rr) =
3.) The probability that IV - 1 will be affected (rr) =
Options are 1/4, 1/2, 1/16, 1/3, 3/4, 2/3, 1/12, 1/6
1.) The probability that III- 3 is a carrier (Rr) =
2.) The probability that III - 4 is a carrier (Rr) =
3.) The probability that IV - 1 will be affected (rr) =
Options are 1/4, 1/2, 1/16, 1/3, 3/4, 2/3, 1/12, 1/6
1 answer:
The genealogy tree which is missing from the question is in the attachment.
Answer: 1) P1 = ; 2) P2 =
; 3)P3 =
Explanation: 1) According to the genealogy tree, the individual III-3 has a P1 = 1/2, because each of the parents are heterozygous for the condition, since one of the ofspring is affected.
2) For individual III-4, one of the parents is heterozygous for the condition, so the probability of being a carrier is P2 = 1/2.
3) Now, for individual IV-1 be affected, the parents has to be carrier. So, this probability, depends on the probability of each parent being heterozygous and that the individual will be carrying the condition, which means:
P3 = 1/2 · 1/2 · 1/4 = 1/16.
The probability of having the condition is 1/16 or 6.25%.
You might be interested in
Taking into account the definition of density and Avogadro's Number, you take 2.0286×10²⁵ molecules of air.
<h3>What is density</h3>Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
<h3>Amount of molecules of air</h3>In this case, you know that:
- Density= 0.97
- Volume= 1 L= 1000 mL
Replacing in the definition of density:
Solving:
mass= 0.97 ×1000 mL
<u><em>mass= 970 g</em></u>
Air has an average molar mass of 28.8 g per 1 mol. Then 970 grams are contained in 33.68 moles.
Now, considering the definition of Avogadro's number you can apply the following rule of three: If 1 mole of air contains 6.023×10²³ molecules, 33.68 moles contains how many molecules?
amount of molecules = (33.68 moles× 6.023×10²³ molecules)÷ 1 mole
<u><em>amount of molecules= 2.0286×10²⁵ molecules</em></u>
Finally, you take 2.0286×10²⁵ molecules of air.
Learn more about
density:
Avogadro's Number:
#SPJ11