I need help with the last two questions pleaseit’s due today.
1 answer:
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Answer:
a. 3:1 (normal bristles to hairless)
b. 2:1 (normal bristles to hairless)
Explanation:
a. If H allele is present, the fly will be hairless. But H allele is lethal at homozygous condition, so all hairless flies will be heterozygous for H locus (Hh). S allele has no effect on bristle number, but in presence of H allele, S produces a "normal" phenotype and is also lethal at the homozygous condition. So genotypes and phenotypes will be like this:
- SSHH: No viable- Lethal
- SSHh: No viable-Lethal
- SShh: No viable-Lehtal
- SsHH: No viable-Lethal
- SsHh: Normal
- Sshh: Hairless
- ssHH: Normal
- ssHh: Normal
- sshh: Normal
A cross between two normal flies carrying the two alleles (SsHh) will produce (according to the attached Punnett Square):
6 Normal (SsHh, ssHh, and sshh)
2 Hairless (Sshh)
Therefore, the ratio of flies with normal bristles to hairless individuals will be 3:1.
b. When the hairless progeny of the previous cross (Sshh) are crossed with one of the parental normal flies from part a (SsHh), it will be produced (according to the second Punnett Square):
8 Normal (SsHh, ssHh, and sshh)
4 Hairless (Sshh)
So, the ratio of flies with normal bristles to hairless individuals will be 2:1.
Option D (E)
<h3>What are Decomposers?</h3>Decomposers are organisms present at the end of the food chain. These are organisms responsible for acting on the dead and decaying organic matter left out by other organisms and converting them into inorganic matter or simply into nutrient-rich soil.
<h3>Role of Decomposers</h3>They help in making nutrients available to the primary producers. In a food chain or food web, they are usually present at the last and complete the life cycle. Decomposers in the case of the terrestrial ecosystems are usually microscopic organisms like <u>fungi, bacteria, or invertebrates like earthworms and millipedes</u> which are responsible for decomposing dead and decaying material.
So, in this particular terrestrial ecosystem, the species at the end of the food web (E) is most likely the decomposer as it ends the food web.
Disclaimer: The question was given incomplete on the portal. Here is the complete question.
Question: Use the following figure to answer the question.
In this food web for a particular terrestrial ecosystem (arrows represent energy flow and letters represent species)
Examine this food web for a particular terrestrial ecosystem. Which species is most likely a decomposer on this food web?
A) A
B) B
C) C
D) E
Learn more about the Decomposers here: brainly.com/question/13526806
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