SAP in the egg jelly of the sea urchin Arbacia punctulata 

Resact (14-amino acid chemotactic peptide)

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#Unit 8. Inheritance Biology

An inversion moves a wild-type allele (red eyes) at the white locus in Drosophila to a chromosomal region that contains highly condensed, the wild-type allele is not expressed in some cells, resulting in an eye consisting of red and white spots.

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#Unit 8. Inheritance Biology

Inversion homozygous - No special problems arise in meiosis. Inversion heterozygous - Two chromosomes form an inversion loop

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#Unit 8. Inheritance Biology

Heterozygous for inversions also exhibit reduced recombination among genes located in the inverted region.

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#Unit 8. Inheritance Biology

In prophase I of meiosis, an inversion loop forms.

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#Unit 8. Inheritance Biology

In Paracentric inversion - a single crossover takes place in the inverted region an unusual structure results

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#Unit 8. Inheritance Biology

Dicentric bridge - Structure produced when the two centromeres of a dicentric chromatid are pulled toward opposite poles