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Ket [755]
3 years ago
8

What would most likely occur in an ecosystem if a nearby volcano erupted and filled the sky with dust particles, which caused si

gnificantly less sunlight to reach the ecosystem over the course of a year?
A. Many plants would die, but the animals would survive.
B. The plants would begin using nutrients in the soil for energy.
C. Many plants and animals would die off.
D. The lack of sunlight would not significantly impact the ecosystem.
Biology
1 answer:
Usimov [2.4K]3 years ago
4 0
C is the correct answer.
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You are interested in mapping the location of two loci in crested geckos that control different aspects of the crest phenotype.
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Answer:

a. Ed/eD

b. RF=0.12

Explanation:

The alleles for genes D/d and E/e are:

  • D_: only on neck spikes
  • dd: along back spikes
  • E_: long spikes
  • ee: short spikes

After testcrossing a double heterozygote (DdEe x ddee) there are 4 types of offspring, two of them much more abundant than the other two. The homozygous recessive parent can only produce <em>ed</em> gametes, so the phenotypes of the offspring depend on the gametes that the double heterozygous parent produced.

The offspring was:

  • Ed/ed 79
  • ed/ed 12
  • ED/ed 10
  • eD/ed 76

Total: 177

a) This result suggests that the genes are linked. Since recombination is a rare event, the most abundant phenotypes always come from the parental gametes, and the least abundant come from the recombinant gametes.

<u>Therefore, the genotype of the doube heterozygote parent was </u><u><em>Ed/eD</em></u><u>.</u>

b) Recombination frequency (RF) = Recombinants / Total

  RF = (12+10)/177

  <u>RF = 0.12</u>

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