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mario62 [17]
3 years ago
13

In an experimental set up, starch is placed in dialysis tubing and suspended in water. When lodine is added to the water, over t

ime the starch solution in the bag turns black, while the color of the water remains the color of diluted iodine. Which of the following most likely occurred?
a. The iodine was not able to cross over the dialysis membrane and the starch turned black.
b. The starch leaked out of the bag, leaving the iodine to oxidize in the bag.
c. The starch stayed in the bag and the iodine leaked into the bag and the reacted with it, turning the solution black.
d. Water oxidized the iodine.
Biology
1 answer:
Anettt [7]3 years ago
7 0

Answer:

c. The starch stayed in the bag and the iodine leaked into the bag and the reacted with it, turning the solution black.

Explanation:

According to the given information, the solution inside the dialysis tubing has starch while water present outside has iodine. The color of the water present outside the dialysis tubing does not change which means that starch did not leak out of the bag and stayed in the bag itself. On the other hand, the starch solution present inside the bag turned black representing the fact that iodine entered the bag. The reaction of starch with iodine produces a blue-black color.

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Answer:

The options:

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B. A carrier mother and an unaffected father

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The CORRECT ANSWER IS C.

C. A carrier mother and a hemophiliac father

Explanation:

Hemophilia is known to be a recessive disorder, a woman would need to have two disease alleles (positioned on both X chromosome) for the disease to be expressed. Therefore, she would need to possess the disease allele from both parents (mother and father).

Hemophilia is an X-linked disorder, and it is hemizygous for male in terms of the hemophilia-related gene (with only a singular allele and express the phenotype linked with the allele). For the hemophilia allele to be inherited in an offspring, the male has to be hemophiliac.

Pairs of parents without a hemophiliac male would not have a hemophiliac daughter, excluding rare conditions (spontaneous mutations occuring in the germline or at growth and maturation of the embryo).

A homozygous woman for this condition (is hemophiliac) or heterozygous woman for the allele in consideration (is an unaffected carriers) could transfer a hemophilia allele to her offspring.

Pairs of parents that without a hemophiliac female or hemophiliac carrier would not yield a hemophiliac daughter (with the exclusion of rare spontaneous mutation situations).

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