"In humans, NLGN4 (another gene associated with ASD) is sex-linked, and NLGN4X and NLGN4Y combine to form an X-Y gene pair." "NLGN4X and NLGN4Y are remarkably conserved with only 19 amino acid differences between them." Nguyen TA, Lehr AW, Roche KW. Neuroligins and Neurodevelopmental Disorders: X-Linked Genetics. Front Synaptic Neurosci. 2020 Aug 11;12:33. doi: 10.3389/fnsyn.2020.00033. PMID: 32848696; PMCID: PMC7431521. NLGN4X and NLGN4Y are homologous, in which of the following cases would you expect recombination to occur between them in meiosis? O When X chromosome is activated If they are located in the Pseudoautosomal region of the sex chromosomes O Never O When X chromosome is inactivated

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Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.