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arsen [322]
3 years ago
8

In fruit flies, the allele for white eyes is recessive to the allele for red eyes. In a generation of fruit flies, 45 males with

white eyes, 46 females with white eyes, 44 males with red eyes, and 47 females with red eyes are produced. Which of the following is the best conclusion you can make about the parents of this generation?
Select one:
a. One parent was heterozygous for eye color and the other was homozygous with red eyes.
b. Both parents were homozygous with red eyes.
c. One parent had white eyes and the other was heterozygous for eye color.
d. Both parents were heterozygous for eye color.


While mRNA strands are being created, a sequence is sometimes miscopied. What is the worst that could happen to a cell should this take place?

a. The cell will not make functional proteins from that mRNA strand.
b. The cell will die once it tries to use that strand of mRNA.
c. The cell will have to destroy any ribosomes that use the mRNA strand.
d. The cell will pass the mRNA on to all the cells made from it.


Which of the following would most likely cause a harmful genetic mutation?

a. Insertion of three base pairs into the genetic sequence.
b. Polyploidy mutations, or inheriting an extra set of chromosomes.
c. Chromosomal mutation in germ-line cells are inherited.
d. Exposure to other mutated organisms or cells.


Can someone help me out with these??? The incorrect answers are 1-A
2- D 3-A

Biology
1 answer:
Aleksandr [31]3 years ago
7 0
1 is C - see first attachment. Genotypes with Y's represent males, and big R represents red eyes, while little r represents white eyes. For example XRxr is a heterozygous (red-eyed) female, and XrYr is a homozygous white-eyed male.

2 is B because the absence of functional proteins and some ribosomes due to the mRNA strand is not as detrimental as the loss of the entire cell.

3 is B. (The insertion of 3 base pairs into a genetic sequence is the length of a single codon, meaning that only one amino acid in the entire polypeptide was added) 

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1) aa- affected

2) Aa- unaffected carrier

3) aa- affected

4) aa- affected

5) Aa - unaffected carrier

6) Aa- unaffected carrier

7) aa- affected

8) aa- affected

9) Aa- unaffected carrier

10) aa- affected

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This trait is <em>recessive</em>.

The F1 generation has a 50/50 chance of having unaffected offspring.

Explanation:

1) Given

2) Some of the offspring have the trait, and they're not affected, so they have to be a carrier

3) The box is shaded in so they have to have the trait, which means they have to have the same gene pattern as the other affected person (#1)

4) They are also shaded in, so they have to have the trait

5) Since the parents either have the trait or are carriers, if they're not affected they have to be a carrier

6) Same reasoning as #5

7) This is shaded in, the box has to have the trait

8) Shaded in = has the trait/affected

9) Since the parents either have the trait or are carriers, if they're not affected they have to be a carrier

10) Shaded in = has the trait/affected

11) Since the parents either have the trait or are carriers, if they're not affected they have to be a carrier

Since the trait is displayed when the people have two lowercase letters (aa), and people can be unaffected and carriers, (Aa), this trait has to be recessive.

If you make a Punnett Square, you will see that half of the offspring can result in an Aa, while the other half can result in an aa, meaning there's a 50/50 chance of the offspring of the F1 (first) generation will have the trait.

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