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Digiron [165]
3 years ago
10

launchpad A Drosophila mutation called singed (s) causes the bristles to be bent and misshapen. A mutation called purple (p) cau

ses the fly’s eyes to be purple in color instead of the normal red. Flies homozygous for singed and purple were crossed with flies that were homozygous for normal bristles and red eyes. The F1 were intercrossed to produce the F2, and the following results were obtained. What are the genotypes of the parental flies in Cross 1
Biology
1 answer:
storchak [24]3 years ago
7 0

Answer:

ppss and PPSS

Explanation:

Just as indicated in the question above, Flies homozygous for singed and purple were crossed with flies that were homozygous for normal bristles and red eyes.

And a Drosophila mutation called singed (s) causes the bristles to be bent and misshapen.

A mutation called purple (p) causes the fly’s eyes to be purple in color instead of the normal red.

Thus, the genotypes of the parental flies in Cross 1 are

PPSS and ppss

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If a molecule of DNA has 30% Adenine how much of the other bases will be present?
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Answer:

If a DNA molecule has 30% Adenine the percentage of the other bases is Thymine: 30% Cytosine: 20% Guanine: 20%.

Explanation:

When the percentage that a base has in a DNA molecule is given, the percentage of the other bases can be known using the Chargaff's base pair rule.

A DNA molecule has the information of the genome of a living being, according to a specific sequence of its nitrogenous bases adenine, guanine, cytosine and thymine.

Chargaff was able to establish that in a DNA molecule the ratio of purine : pyrimidine of 1:1, so there must be the same amount of thymine as adenine and a similar amount of guanine for the cytosine, taking into account the complementarity of bases.

Taking into account the law of the base pair, if in a DNA chain there is 30% of Adenine, in the molecule there is:

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  • <em>Guanine 20%. </em>
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In this case, the <u>Chargaff rule is useful to determine the percentage of nitrogenous bases that exist in a DNA molecule, knowing the percentage of a single base</u>.

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