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Ch. 10 - Eukaryotic Chromosome Abnormalities and Molecular Organization
Sanders - Genetic Analysis: An Integrated Approach 3rd Edition
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Tutti i libri di testoSanders 3rd EditionCh. 10 - Eukaryotic Chromosome Abnormalities and Molecular OrganizationProblema 12d
Capitolo 10, Problema 12d

A pair of homologous chromosomes in Drosophila has the following content (single letters represent genes):
Chromosome 1RNMDHBGKWU
Chromosome 2RNMDHBDHBGKWU
How does the pairing diagrammed in part (b) differ from the pairing of chromosomes in an inversion heterozygote?

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1
Examine the given chromosome sequences: Chromosome 1 (RNMDHBGKWU) and Chromosome 2 (RNMDHBDHBGKWU). Note that Chromosome 2 contains a duplication of the segment 'DHBG'.
Understand the concept of an inversion heterozygote: In an inversion heterozygote, one homologous chromosome contains a segment that has been inverted (flipped in orientation) compared to the other homologous chromosome.
Compare the given pairing to an inversion heterozygote: In the given pairing, the difference is due to a duplication of a segment ('DHBG') in Chromosome 2, not an inversion. In an inversion heterozygote, the homologous chromosomes would align with a loop structure to accommodate the inverted segment.
Describe the structural difference: In the given pairing, the chromosomes align without forming a loop because the difference is a duplication, not an inversion. In contrast, an inversion heterozygote would require a loop to align the inverted segment with its homologous counterpart.
Conclude the comparison: The pairing in the given problem differs from an inversion heterozygote because it involves a duplication rather than an inversion. The structural adjustment (loop formation) seen in inversion heterozygotes is not necessary here.

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Homologous Chromosomes

Homologous chromosomes are pairs of chromosomes in a diploid organism that have the same genes at the same loci but may carry different alleles. In Drosophila, these chromosomes can undergo various structural changes, including inversions, which can affect gene expression and pairing during meiosis.
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Chromosome Structure

Inversion Heterozygote

An inversion heterozygote is an individual that has one normal chromosome and one chromosome with a segment inverted. This structural alteration can disrupt normal pairing during meiosis, leading to potential issues in gamete formation, such as the production of unbalanced gametes due to improper crossing over.
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Inversions

Meiotic Pairing

Meiotic pairing refers to the alignment of homologous chromosomes during meiosis, which is crucial for accurate segregation of genetic material. In the presence of inversions, the pairing may be altered, leading to unique configurations that can affect genetic recombination and the viability of gametes.
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Diploid Genetics
Pratica correlata
Domanda del libro di testo

A pair of homologous chromosomes in Drosophila has the following content (single letters represent genes):

Chromosome 1RNMDHBGKWU

Chromosome 2RNMDHBDHBGKWU

What term best describes the unusual structure that forms during pairing of these chromosomes?

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Domanda del libro di testo

An animal heterozygous for a reciprocal balanced translocation has the following chromosomes:

      MN • OPQRST

      MN • OPQRjkl

      cdef • ghijkl

      cdef • ghiST

Identify the gametes produced by alternate segregation. Which, if any, of these gametes are viable?

519
views
Domanda del libro di testo

A pair of homologous chromosomes in Drosophila has the following content (single letters represent genes):

Chromosome 1RNMDHBGKWU

Chromosome 2RNMDHBDHBGKWU

Diagram the pairing of these homologous chromosomes in prophase I.

384
views
Domanda del libro di testo

An animal heterozygous for a reciprocal balanced translocation has the following chromosomes:

      MN • OPQRST

      MN • OPQRjkl

      cdef • ghijkl

      cdef • ghiST

Diagram the pairing of these chromosomes in prophase I.

450
views
Domanda del libro di testo

A pair of homologous chromosomes in Drosophila has the following content (single letters represent genes):

Chromosome 1RNMDHBGKWU

Chromosome 2RNMDHBDHBGKWU

What term best describes this situation?

547
views
Domanda del libro di testo

An animal heterozygous for a reciprocal balanced translocation has the following chromosomes:

      MN • OPQRST

      MN • OPQRjkl

      cdef • ghijkl

      cdef • ghiST

Identify the gametes produced by adjacent-1 segregation. Which, if any, of these gametes are viable?

497
views