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evablogger [386]
3 years ago
10

What do you know about an organisms parents if it is heterozygous for a certain trait ?

Biology
1 answer:
NeX [460]3 years ago
8 0

Answer:

b. they present different traits

Explanation:

they are diffrent because heterozygous isnt allways the same.

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Which of the following is an organism whose cells each contain a membrane-bound nucleus?
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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)

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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)

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4 Hairless (Sshh)

So, the ratio of flies with normal bristles to hairless individuals will be 2:1.

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3 years ago
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