Figure 1: Haplodiploidy and its alteration by PSR. | Scientific Reports

Figure 1: Haplodiploidy and its alteration by PSR.

From: A ‘selfish’ B chromosome induces genome elimination by disrupting the histone code in the jewel wasp Nasonia vitripennis

Figure 1

(Top) Mated N. vitripennis females naturally fertilize ~80% of eggs, which develop as diploid female embryos from genetic contribution of the sperm and egg nuclei (blue and red dots, respectively). The unfertilized eggs develop as haploid male embryos, with genetic contribution from only the egg. (Bottom) Females when mated with PSR-carrying males still fertilize ~80% of their eggs. However, the sperm-contributed genome, which harbors the paternally-transmitted PSR chromosome (green dot), fails to condense into chromosomes during the first mitosis and is lost during subsequent divisions. In contrast, the PSR chromosome associates with the egg-derived chromatin and segregates successfully. These events convert all fertilized eggs, which should become female, into PSR-transmitting male embryos.

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