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SashulF [63]
2 years ago
9

What only happens during a chemical reaction?

Biology
2 answers:
morpeh [17]2 years ago
6 0
I would think it would be c a new substance is formed because it wont be able to originate to it's original form.
Hoochie [10]2 years ago
3 0
What only happens during a chemical reaction?<span>a. Bubbles form. False 
b. A solution is made. True!
c. New substances are formed. False
d. Colors change. False</span>
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In a cross between two heterozygous individuals (eg. Rr X Rr), the expected phenotypic ratio of the offspring would be A) 1:2:2:
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Sickle-cell trait is caused by a single defective allele, but sickle-cell disease only occurs in individuals that are homozygous
Pavel [41]

Answer:

6,25%

Explanation:

Considering that the couple has a trait of sickle cell anemia, we know that both are heterozygous for the disease (Aa) and therefore can have children with the following genotypes:

Parents: Aa X Aa

Children: AA(A x A), Aa(A x a), Aa (a x A) and aa(a x a)

Knowing that sickle cell anemia only occurs in homozygous individuals, the probability for children to have the disease according to each crossing is:

A x A = 1/4 = 25%

A x a = 1/4 = 25%

a x A = 1/4 = 25%

a x a = 1/4 = 25%

The probability of forming each homozygous child (aa) is 1/4 or 25%. Since they are two children, the probability of both having sickle cell anemia is calculated by multiplying the probability of each, so:

1/4 × 1/4 = 1/16 = 0.0625 = 6.25%

It is concluded that the probability of a heterozygous couple for sickle cell anemia to have two children with the disease is 6.25%.

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3 years ago
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