Chromosome inheritance? Not the same for all the chromosomes
Friday, October 7, 2011 - 12:30
in Biology & Nature
New findings show that in aphids the two X chromosomes have a different inheritance. Aphids are insects with a sex determination model based on the presence of two X chromosomes (XX) in females and a single X chromosome (XO) in males. Previous studies suggested that X chromosome loss during male determination was random and that both X chromosomes have the same probability to be inherited in males. On the contrary, some authors suggested the presence of strong biases in the transmission of sex chromosomes, so that X chromosomes may have a non-mendelian inheritance in aphids.