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Rasek [7]
4 years ago
11

What are the advantages of having perforated walls among the vessel elements?

Biology
1 answer:
Brilliant_brown [7]4 years ago
3 0

Answer:

It allows rapid conduction of water from one vessel element to the next.

Explanation:

Vessels are one of the two types of conducting cells of xylem. Vessels are made of vessel elements. Vessel elements are the individual cells with perforation plates. The perforation plates have large holes (perforations). Perforation plates of adjacent vessel elements allow easier conduction of water from one vessel element to the next.

The perforated end walls of vessel elements allow these conducting cells to conduct water more readily than tracheids. Stacking of vessel elements with perforated end walls make the vessel like a water pipe through which water is being readily conducted.

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At one gene locus in humans there are 2 alleles: one for curly hair and another for straight hair. Neither allele is dominant, a
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25%

Explanation:

<u>Genotypes and phenotypes:</u>

  • SS = straight hair
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  • SC = wavy hair
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A man with straight hair and A blood has the genotype SS AA or SS A0.

A woman with wavy hair and B blood has the genotype SC BB or SC B0.

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Because the child has type 0 blood, both parents must have a 0 allele, so their genotypes are SS A0 and SC B0.

<u>If their second child is a boy with straight hair, what is the probability that he has A blood?</u>

The hair and blood type genes are independent, so the hair phenotype of the child is irrelevant to determine the probability of him having A blood.

The parental cross for blood type is A0 x B0.

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The answer is the child has a probability of 25% of having A blood.

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