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Fiesta28 [93]
3 years ago
6

Which type of chromosome abnormality is the most difficult?

Biology
1 answer:
Rzqust [24]3 years ago
3 0
Down syndrome, turner syndrome, Klinefelter syndrome, and fragile X syndrome.
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If an organism is homozygous for a particular trait, the organism A. has extra alleles on both chromosomes in a chromosome pair.
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<em>B. Has the same allele on both chromosomes in a chromosome pair. </em>

<u>Here is why:</u>

Homozygous means the same, while heterozygous means different. If both of the same alleles are on both chromosomes, then it will be a homozygous.

There can be two types of homozygous alleles.

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<em>Homozygous Dominant</em>: BB

<em>Homozygous Recessive</em>: bb

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<em>Heterozygous</em>: Bb

<u>Notice how both are different alleles.</u>

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Below I have attached a diagram of a Punnett square I have made.

On the left is a homozygous recessive allele pair.

On the top is a heterozygous allele pair.

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