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An individual is heterozygous for an inversion. The non-inverted allele has genes in the following order:...

An individual is heterozygous for an inversion. The non-inverted allele has genes in the

following order: A B ● C D E F G H I . The inverted allele has genes in the following

order: A B ● C D G F E H I . If a crossover between F and G occurs during meiosis in

this individual, which of the following is not a gamete that could be produced from this

meiosis?

a. A B ● C D E F G H I

b. A B C ● D

c. A B C ● D E F

d. I H E F G H I

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Answer #1

ANSWER

The correct answer is Option D.

The inversion present between the given chromosomes is paracentric inversion. It does not involve centromere. During the gamete formation in paracentric inversion, gametes with duplication and regulation of gene fragments are formed. Parental gametes are always formed in any type of chromosomal rearrangement.

We can see that in first option, normal parental gametes formed. In second and third option, gametes with deletion are present. So these three options are correct.

In the last option there is no centromere in the given gamete. It is acentric fragment. Acentric fragment and dicentric fragment are formed in pericentric inversion which involves centromere.

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