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Oksi-84 [34.3K]
3 years ago
13

A beaker of distilled water was placed on a bench. Using a pipette a drop of red blood cells was placed at the bottom of the bea

ker Explain why the water in the beaker was uniformly red after 2 hours
Biology
1 answer:
Scorpion4ik [409]3 years ago
5 0

Explanation:

when the red blood cells are placed in the water, differences in concentration causes haemolysis to occur at a point,excess pressure in the cell on cell membrane causes the cell to burst, diffusion then takes places causing the molecules of the red blood cells to be distributed evenly throughout the distilled water

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What is absorption?
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Answer:

option(B)

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The dominant allele H reduces the number of body bristles in fruit flies, giving rise to a hairless phenotype. In the homozygous
DerKrebs [107]

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.

7 0
3 years ago
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