Answer:
rough endoplasmic reticulum
Chromatid means each of the two threadlike strands into which a chrosome divides longitudinally during cell division. Each contains a double helix of DNA
The formation of the first cells is common in both hypotheses.
The probability is 1/16 that a gamete will receive only paternal chromosomes. In life
cycles that alternate between haploid and diploid stages, fertilization doubles
the number of chromosomes per cell, The pairing of chromosomes along
their lengths , which is essential for crossing over is referred to as synapsis
