Why is crossing over not possible in meiosis II?

If an organism has 10 chromosomes in its gametes, how many chromosomes will it have it it diploid cells?

A mother brings her 8-year-old son to the clinic. Three days earlier he and another child had been “sword fighting” with wooden swords. The boy received a sharp blow to his right lower extremity, and since then his foot has “dragged” when he walks. Physical examination shows that he can raise up on his toes, but cannot walk on his heels. Further testing shows that he cannot dorsiflex his right foot. Sensation is intact on the foot, except for numbness of the web space between the first and second digits. Which one of the following is the most likely site of his injury?

A woman falls from her bicycle, landing on her elbow. The impact with the ground damages her ulnar nerve as it passes through the cubital tunnel. If the ulnar nerve loses all function as a result of this injury, what is the likely effect on the metacarpophalangeal (MCP) joints of her hand?

To help prevent aspiration, residents should be in the _______ position when eating

During the process of photosynthesis, solar energy is converted into

The process of copying the DNA is called ______________________.

A patient suffers from hyperhidrosis (excessive sweating) on the palms of both hands. The sweating is profuse, and causes a great deal of discomfort and embarrassment. The cell bodies of the axons that directly contact and provide motor innervation (GVE) to the sweat glands of the hand are located in which one of the following structures?

The location where DNA replication begins is called ____________________________________.

The spindle is