Organisms are classified in three domains. The domain Eukarya is divided into four kingdoms. Meiosis occurs in the kingdom Plantae.

Biology
IGCSE&ALevel
CAIE
Exam No:9700_s25_qp_44 Year:2025 Question No:4(b)

Answer:



Knowledge points:

5.1.1.1 DNA
5.1.1.2 histone proteins
5.1.1.3 sister chromatids
5.1.1.4 centromere
5.1.1.5 telomeres
5.1.2.1 growth of multicellular organisms
5.1.2.2 replacement of damaged or dead cells
5.1.2.3 repair of tissues by cell replacement
5.1.2.4 asexual reproduction
5.1.3.1 interphase (growth in G1 and G2 phases and DNA replication in S phase)
5.1.3.2 mitosis
5.1.3.3 cytokinesis
5.1.4 outline the role of telomeres in preventing the loss of genes from the ends of chromosomes during DNA replication
5.1.5 outline the role of stem cells in cell replacement and tissue repair by mitosis
5.1.6 explain how uncontrolled cell division can result in the formation of a tumour
5.2.1 describe the behaviour of chromosomes in plant and animal cells during the mitotic cell cycle and the associated behaviour of the nuclear envelope, the cell surface membrane and the spindle (names of the main stages of mitosis are expected: prophase, metaphase, anaphase and telophase)
5.2.2 interpret photomicrographs, diagrams and microscope slides of cells in different stages of the mitotic cell cycle and identify the main stages of mitosis

Solution:

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