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SOVA2 [1]
3 years ago
11

Analysis of the data obtained shows that two students each have two fragments, two students each have three fragments, and two s

tudents each have one only.
What does this demonstrate?
Biology
1 answer:
Readme [11.4K]3 years ago
6 0

Question: Please use the following information to answer the question(s) below.  A group of six students has taken samples of their own cheek cells, purified the DNA, and used a restriction enzyme known to cut at zero, one, or two sites in a particular gene of interest.

Analysis of the data obtained shows that two students each have two fragments, two students each have three fragments, and two students each have one only. What does this demonstrate?

Answer:

"The two students who have two fragments have one restriction site in this region."

Explanation:

A restriction enzyme, restriction endonuclease, or restrictase is an enzyme that cuts DNA into trashes at or close precise appreciation sites inside particles identified as restriction locations. Restriction enzymes are one session of the wider endonuclease collection of enzymes. In the laboratory, restriction enzymes (or restriction endonucleases) are used to cut DNA into minor trashes. The scratches are constantly made at exact nucleotide arrangements. Unlike restriction enzymes recognise and cut diverse DNA sequences.

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In flies, Red eyes are dominant to white. If a true-breeding red-eye fly bred with a true breeding white-eye fly, the offspring
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Answer and Explanation:

<u>Available data</u>:

  • Red eyes are dominant to white
  • Dominant allele R
  • Recessive allele r

Cross: true-breeding red-eye fly bred with a true breeding white-eye fly

Parentals)           RR           x       rr

Phenotypes) Red-eyed     White-eyed

Gametes)       R         R           r         r

Punnett square)     R          R

                       r      Rr         Rr

                       r      Rr         Rr

F1) 4/4 = 100% of the progeny will be heterozygous for the trait expressing     red eyes, Rr

---------------------------------------------------------------------------------------------------------

In <em>Drosophila melanogaster,</em> the fruit fly, the gene for the eye color is X-linked. So in this species:

- X⁺ expresses red eyes ----- > + is the dominant allele for red color

- X⁻ expresses white eyes ----> - is the recessive allele for white color

<u>Option 1:</u> true-breeding red-eyed females and white-eyed male

Parentals)                X⁺ X⁺          x       X⁻Y

Phenotypes) Red-eyed female     White-eyed male

Gametes)           X⁺            X⁺             X⁻         Y      

Punnett square)      X⁺           X⁺

                     X⁻    X⁺X⁻       X⁺X⁻

                     Y      X⁺Y         X⁺Y

F1) 4/4 = 100% of the progeny will express red eyes

    50% of individuals are red-eyed males, X⁺Y

    50% of individuals are red-eyed heterozygous females, X⁺X⁻

<u>Option 2:</u> true-breeding white-eyed females and red-eyed male

Parentals)                X⁻ X⁻         x       X⁺Y

Phenotypes) Red-eyed female     White-eyed male

Gametes)           X⁻            X⁻             X⁺         Y      

Punnett square)      X⁻           X⁻

                     X⁺    X⁺X⁻       X⁺X⁻

                     Y      X⁻Y         X⁻Y

F1) 2/4 = 50% of the progeny will be females expressing red eyes, X⁺X⁻

    2/4 = 50% of the progeny will be white-eyed males, X⁻Y

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