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Serga [27]
3 years ago
7

I’m stupid so can someone help me plz.

Biology
1 answer:
Lemur [1.5K]3 years ago
3 0

what do you need help with? like the question

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Which chromosomal defect is caused when part of a chromosome breaks off and reattaches backward on the same chromosome?
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The right answer is inversion.

Inversion is a genetic mutation characterized by the end-to-end reversal of a portion of chromatid on a chromosome.

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We distinguish :

Paracentric inversions:  The centromere in the chromosome is not included in the inversion.

Pericentric inversions:  The centromere is included in the inversion which transforms a metacentric chromosome into an acrocentric chromosome.

8 0
3 years ago
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Why are few genetic disorders controlled by dominant alleles?
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Answer:

a mutant dominant allele is expressed in very individual who inherits even one copy points a seriosbdisorder where people can die young and fail to reproduce so basically a dominant allele with die out of population

7 0
2 years ago
Which option explains why genes are sections of chromosomes, but chromosomes are not made up of genes?
Nitella [24]

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A chromosome is made of a very long strand of DNA and contains many genes (hundreds to thousands). ... The genes on each chromosome are arranged in a particular sequence, and each gene has a particular location on the chromosome (called its locus).

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