Juan’s family has a history of sickle cell disease. His father died of sickle cell disease complications when Juan was six years old. He remembers his father being in great pain. Juan marries Gina. Gina’s maternal grandmother and paternal grandfather had sickle cell disease, but neither of her parents has the disease. Juan does not want to have children because he is convinced they will have sickle cell disease. Gina is not so sure. They have come to you for advice about having whether or not to have children. Based on your calculations of the probability of their child getting sickle cell disease, what is your advice? Show your calculations and explain your reasoning for your response. It may be helpful for you to draw pedigrees and possible Punnett squares for both Juan and Gina’s families

Answers

Answer 1

Answer: Sickle cell disease is a hereditary disease. This means that someone can get sickle cell disease if they receive the sickle genes from BOTH parents. If someone receives a sickle gene from only one parent, then this person does not have sickle cell disease, but instead has the sickle cell trait. This means that they can still pass the trait on to their offspring. Because Juan's father had sickle cell disease and Juan does not, he carries the sickle trait. Since Gina's maternal grandmother had sickle cell disease, Gina's mother had a 50 percent chance of carrying the trait. Since Gina's father doesn't have the trait, Gina thus has a 25 percent chance of carrying the trait. If Gina has a 25 percent chance of carrying the trait and Juan has a 100 percent chance, then together they have a 125/200 chance of both passing the trait on to their children. 125/200 = .625, so they would have a 62.5 percent chance of passing on this trait to their children. Although this percentage does not mean their children would definitely have sickle cell disease, I would advise Juan and Gina to weigh their options, since 62.5 is more than 50 percent.

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Which method describes an example of absolute dating?A.
determining the vertical sequence of rock layers

B.
measuring the radioactive decay of isotopes within rock layers

C.
determining the horizontal sequence of rock layers

D.
identifying index fossil in rock layers

Answers

B) generally scientists will measure the decay of carbon 14 which is a radioactive isotope of carbon with a specific half life (I think 5437 years but I could be way off don't hold me to that number) and that way scientists can tell how old a fossil is
Hope this helped

If element X has 18 protons, how many electrons does it have?

Answers

18 electrons. The element is electrically neutral. it has as much protons as electrons

18 as well, I believe.

What process is represented in the diagram below?A. Asexual reproduction
B. Sexual reproduction
C. Regeneration
D. Vegetative propagation

Answers

Answer:

A. Asexual reproduction

Explanation:

Because it requires only one cell.

However sexual reproduction require two cell for reproduction.

Asexual because it only needs one .

Explain why inflammation cannot occur in an ameba or in a dead body. Does inflammation have beneficial or noxious effects on the human body?

Answers

Answer:

Inflammation occurs only in live tissues and multicellular organisms

Explanation:

Inflammation is a response to foreign antigen by the bodies immune system. Where chemicals from the white blood cells are released to the blood or affected tissue.

It cannot occur in dead bodies because the cells are dead too.

Amoeba is a single celled organism that cannot posses the complex components of the immune system.

Inflammation helps eliminate the initial cause and initiates tissue repair

Due to increase of blood flow to the affected region, it may cause redness and pain.

Which two atoms form an ionic bond?A. Two sodium atoms
B. Two oxygen atoms
C. Sodium and bromine
D. Fluorine and chlorine

Answers

Answer:

Sodium and bromine

Explanation:

Ionic bond is a type of chemical bond and binds the chemical molecules together. Ionic bond is formed by the transfer of electrons from an electropositive element ( metal) to the electronegative element (non metal).

Sodium is an electropositive element and contains one positive charge. Bromine is an electronegative element with a single negative charge over it. Sodium gives the electron to bromine and results in the formation of ionic bond.

Thus, the correct answer is option (C).

Sodium and bromine would form an ionic bond. The one valence electron from sodium would be transferred to the bromine atom in order to obtain octet for both.

. In fruit flies, normal wings are dominant and short wings are recessive. Construct a Punnett square wherein both parents are heterozygous for normal wings. Which of the following is the correct genotypic ratio for the F1 generation of this cross?25% of the offspring are homozygous for normal wings. 50% of the offspring are heterozygous for normal wings. 25% of the offspring are homozygous recessive for short wings.
75% of the offspring have normal wings, and 25% of the offspring have short wings.
50% of the offspring are heterozygous for normal wings. 50% of the offspring are homozygous recessive for short wings.
75% of the offspring are heterozygous for normal wings. 25% of the offspring are homozygous recessive for short wings.

Answers

Answer:

25% of the offspring are homozygous for normal wings. 50% of the offspring are heterozygous for normal wings. 25% of the offspring are homozygous recessive for short wings.

Explanation:

Let dominant allele be A and recessive allele be a

Parent 1: heterozygous normal wings = Aa

Parent 2: heterozygous normal wings = Aa

Parent 1 X Parent 2 :

A a

A AA Aa

a Aa aa

Genotype of progeny will be as follows:

1/4 or 25% = AA = homozygous dominant for normal wings

1/2 or 50% = Aa = heterozygous normal wings

1/4 or 25% = aa = homozygous recessive for short wings