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Sati [7]
3 years ago
10

Would you be likely to find a food chain containing 10 links? Why or why not?

Biology
1 answer:
katen-ka-za [31]3 years ago
5 0
It would be highly unlikely to discover a food chain containing 10 links.
This is mainly due to the loss of energy that occurs with transitions through the links in the chain.  Almost 90 percent of the energy obtained at one trophic level is lost when being transmitted to the other trophic level ( link in the food chain).
This means that the 10th link in the chain would get so little energy consuming the 9th level organism that it wouldn't be enough to survive.
The 2nd link gets only 10% of the initial energy absorbed by the 1st link in the chain. If the chain is 10 links long, you would lose 90% with each link, leaving next to nothing for the last few links.
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Glucose-6-phosphate dehydrogenase deficiency (G6PD) is inherited as an X-linked recessive allele in humans. A woman whose father
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(a) 1/2; (b) no

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Glucose-6-phosphate dehydrogenase deficiency (G6PD) is an X-linked recessive disorder and the woman's father was diseased so it means that woman is a carrier of the allele but has normal phenotype. It means that she will have XXᵇ genotype.

In contrast to this, her husband is diseased so his genotype will be XᵇY.

The Punnett square diagram related to the cross is attached.

(a) Proportion of their sons expected to be G6PD is 1/2:

They both may give birth to 4 progeny with genotypes XXᵇ, XᵇXᵇ, XY and XᵇY. It means they both may have 2 sons out of which one with genotype XᵇY will be diseased while the one with genotype XY will be healthy. So the proportion of their sons having G6PD is 1/2 or 50%.

(b) If the husband were G6PD deficient, the answer will not change.

The reason behind this is that this disease is caused by an allele located in X chromosome. But father contributes only Y chromosome to his son not X chromosome. The X chromosome will affect the genotype of his daughter not son that is why answer will not change. It means they will still have 1/2 of their sons diseased.  

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