Looking into your microscope, you spot an unusual cell. Instead of the typical rounded cell shape, the cell has a very narrow middle separating two bulging ends. It sort of looks like the number 8! You realize that this cell is A) undergoing cytokinesis B) in the S phase of interphase. C) in the G1 phase of interphase. D) about to undergo mitosis.

Explanation:

Cell completes its division by karyokinesis and cytokinesis.

The division of nucleus is known as karyokinesis which divided into two main phases known as inter-phase and mitotic phase.

Inter-phase is further divided into G1, S and G2 phase, in S phase, replication of DNA occurs. Mitotic phase is further divided into prophase, metaphase, anaphase and telophase.

After telophase, Cytokinesis occurs. Cytokinesis is the process of the division of cytoplasm, which occurs after karyokinesis. In cytokinesis, the cell contains a very narrow middle separating 2 bulging ends and the cells looks like as  the number 8.

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explanation:

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation: