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puteri [66]
3 years ago
8

Assume that you are studying a trait determined by a number of polygenes. if there are seven phenotypic categories, how many gen

es are probably involved?
Biology
1 answer:
mestny [16]3 years ago
3 0
There should be 3 genes involved in the seven phenotypic categories 
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How can the cells in a multicellular organism differ from each other when they all have identical DNA
aleksley [76]
Well all cells in a multicellular organism have the same exact DNA (except for sex cells). But what makes each type of cell different physically and functionally is the genes that are expressed in those cells.So for like example a different section of the DNA molecule is expressed in a nerve cell than a skin cell.
4 0
3 years ago
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During the course of an action potential, the membrane potential rapidly rises and reaches a peak of about +40 mV before falling
ad-work [718]

Answer:

A)  A decrease in Na+ permeability, and an increase in K+ permeability.

Explanation:

When the potential action reaches a peak of about +40 mv Na+ channels are open and a high number of Na+ ions are entering the inside of the cell. Shortly after this happens the K+ channels will start to open their gates increasing the cell  K+ permeability  while the Na+ channels will start to close their gates, so the Na+ permeability will decrease. This happens  in order to valance the positive charge on the inside of the cell. Normally the inside has a negative charge while the outside has a positive one, as the inside is more positive due to the increase in Na+ permeability at the beginning of the potential action, K+ cations (which are in abundance in the cell) will have to go out through the K+ channels  so as to restore the charge valance, that means that there is an increase in K+ permeability.

3 0
2 years ago
Sleep produces an "uncoupling" of neurobehavioral systems, providing the ____ with a break.​
Inessa [10]
Central nervous system
4 0
2 years ago
What is the primary source of nitrogen and phosphorus for a secondary consumer? *
Feliz [49]

Answer:

Hope this helps :)

https://www.sciencedirect.com/topics/engineering/nitrogen-source

Think this is the website you're looking for

Explanation:

4 0
3 years ago
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Drosophila may be trisomic for chromosome IV and remain fertile. The gene determining the shape of bristles is in chromosome IV.
aev [14]

Answer:

I am going to give you the material so that you can be your doubt but I will not solve it because that is the basis of your learning that you react to what you are reading

In Mendel's "Experiment 1", pea plants with smooth seeds intersect with pea plants with rough seeds. (smooth seeds is the dominant feature). Mendel collected the seeds of this cross, the plants and obtained the F1-generation of plants, let them self-pollinate to form a second generation, and analyzed the seeds of the F2 generation. The results they obtained; And the ones you would predict in this experiment are:

Guide

F1-generation plants

Mendel crossed SS (smooth seeds) with ss (rough seeds.)

All the gametes of parents smooth seeds, have the allele S (dominant) and all the gametes of parents rough seeds have the allele s (recessive). All the plants of the F1 generation will affect the Ss genotype (heterozygous), and all the seeds smooth seeds.

Generation-F2 plants

Mendel let the F1-generation plants self-pollinate to form a second generation and analyzed the seeds of the resulting F2 generation.

F2 generation    

All F1 hybrid plants have the Ss genotype and all are smooth (dominant characteristic). Recessive alleles are secreted during gamete formation. As a result, one in four possible combinations in F2 generation plants will have the recessive homozygous genotype (ss).

4 0
3 years ago
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