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Alex73 [517]
3 years ago
10

How could the rerouting of a river affect the surrounding lowland?

Biology
1 answer:
galina1969 [7]3 years ago
3 0
The answer to your first question is the land becomes a lot dryer, so plants die. The answer to your second question is deposition.
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In Drosophila, the genes crossveinless and Stubble are linked, about 7 map units apart on chromosome 3. cv is a recessive mutant
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Answer:

0.035

Explanation:

<u>cv+ is the wild-type dominant allele over cv, therefore:</u>

  • cv+cv+ and cv+cv cause wild-type phenotype for crossveinless
  • cv cv causes the crossveinless phenotype

<u>Sb is a dominant mutant allele over wild-type Sb+, therefore:</u>

  • Sb Sb and Sb Sb+ cause Stubble phenotype
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<h3><u>Test cross</u></h3>

It's the cross between the heterozygous female with a homozygous recessive male. Remember that cv and Sb+ are the recessive alleles.

\frac{cv\   Sb^+}{cv^+\ Sb}  X \frac{cv \ Sb+}{cv \ Sb+}

-The male produces only 1 type of gamete: cv Sb+

-The female produces 4 types of gametes:

  • cv Sb+   ] Parental
  • cv+ Sb   ] Parental
  • cv Sb     ] Recombinant
  • cv+ Sb+ ] Recombinant

The genes are linked and separated by 7 map units. A distance of 7 mu means that 7% of the resulting gametes will be recombinant. Because there are 2 possible recombinant gametes, each of them will appear in 3.5% of the cases.

The genotypes and proportions of the offspring resulting from the test cross can be seen in the Punnett Square. The phenotypically wild-type individuals will have the genotype cv+ Sb+ / cv Sb+ (heterozygous for crossveinless and homozygous recessive for Stubble) and a 0.035 proportion.

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