What causes genetic variation during human sexual reproductive processes?

the zygote cell divides many times through mitosis to form a blastocyst during embryo formation.

adjacent chromatids in homologous chromosomes cross over during meiosis in sperm and egg formation.

mitochondria, containing mitochondrial dna, collect in the midpiece of sperm cells during sperm formation.

spindle fibers form between centrioles before attaching to chromosomes during meiosis in gamete formation.

Which of the following shows the correct order in which light information travels through the eye? (2 points) lens, pupil, retina, optic nerve pupil, lens, retina, optic nerve pupil, lens, optic nerve, retina lens, pupil, optic nerve, retina

The blue particles in this image are able to cross the cell membrane through simple diffusion. how will they be transported? outside the cell inside the cell o a. the substances will move directly across the membrane from outside the cell to inside the cell. b. the substances will move through channels in the membrane proteins from outside the cell to inside the cell. o c. the substances will move through channels in the membrane proteins from inside the cell to outside the cell. o d. the substances will move directly across the membrane from inside the cell to outside the cell.

All annelids and arthropods have a blank body plan . unlike annelids, arthropods also have blank . the circulatory system of annelids is blank , while circulatory system of arthropods is blank .