Sex determination in humans is primarily influenced by the presence of the Y chromosome, with various exceptions complicating the biological narrative.
Scientists Question the Conventional Y Chromosome Wisdom
Researchers discovered evidence that certain genetic elements can skew sex ratios toward male offspring beyond the expected 50/50 split, with one family showing a 2:1 male-to-female ratio across generations.
Sex determination in humans is primarily influenced by the presence of the Y chromosome, with various exceptions complicating the biological narrative.
Molecular basis of oocyte cytoplasmic lattice assembly
Cryo-EM reveals the cytoplasmic lattice in mammalian oocytes comprises repeating U-shaped basket and adapter ring units with 14 protein subunits, essential for oocyte maturation and embryonic development.
Sperm motility peaks in summer months and declines in winter regardless of climate, suggesting seasonal patterns affect male fertility beyond temperature alone.
