Answer the questions that follow for each stage of the cell cycle (g1, s, g2, prophase, metaphase, anaphase, telophase). if necessary, use an arrow to indicate a change that occurs during a particular cell cycle stage (for example, 1→ 2 or yes → no). a. how many chromatids comprise each chromosome during this stage? b. is the nucleolus present? c. is the mitotic spindle organized? d. is the nuclear membrane present?

the answer is based on 46 chromosomes assuming humans.

G1.

Chromatids: 46 chromosomes/ 46 chromatid.

Nucleolus: yes. only disappears during mitosis( RNA synthesis is crucial for making proteins all the time)

Mitotic spindle: no. only appears during mitosis.

Nuclear membrane: yes. only disappears during mitosis.

S. DNA replication occurs.

Chromatids: 46 chromosome/ 92 chromatids

Nucleolus: yes

Mitotic spindle: no

Nuclear membrane: yes

G2

Chromatids: 46 chromosome/ 92 chromatids

Nucleolus: yes

Mitotic spindle: no

Nuclear membrane: yes

Prophase:

Chromatids: 46 chromosome/ 92 chromatids

Nucleolus: will disintegrate at the beginning of the phase.

Mitotic spindle: starts to arrange at the beginning of the phase.

Nuclear membrane: starts dissolving at the beginning of the phase.

metaphase, (chromosomes appear in the middle)

Chromatids: 46 chromosome/ 92 chromatids

Nucleolus: no

Mitotic spindle: arranges chromosomes in the middle.

Nuclear membrane: no

anaphase, sister chromatids split and move to either poles of the cell

Chromatids: 92 chromosome / 92 chromatids)

Nucleolus: no

Mitotic spindle: starts to disassemble during early telophase.  

Nuclear membrane: no

telophase at the end of telophase when the cytoplasm finally splits

Chromatids: 46 chromosome / 46 chromatids per cell

Nucleolus: yes

Mitotic spindle: starts to disassemble during early telophase.  

Nuclear membrane: will start to form at the end of telophase.

Remember that is a continuous process it has been named in 4 phases by humans to study it.

d. in sexual reproduction, offspring have more chromosomes than

either parent.

asexual reproduction results in offspring which are genetically the same as the parent organism (not counting a rare mutation). sexual reproduction produces a random mixture of the genetics derived from both parents

explanation:

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.