Practise IB Biology SL D2.1 by identifying mitosis stages, explaining cytokinesis and interpreting cell-division evidence.
75 questions in this syllabus scope, with question parts counted together.
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Hereditary information is stored in nucleic acids and passed on to offspring.
Outline how mitosis allows for the same hereditary information to be passed on to new cells.
Both the genome and the environment of an organism affect its growth and development. Variation between individuals of a species can be continuous or discrete (discontinuous). Mitosis produces identical cells for growth and meiosis allows for variation.
The micrographs show onion and whitefish cells in mitosis.
The process of cytokinesis is occurring in the whitefish embryo cells. Explain how cytokinesis occurs in this animal cell.
Daughter cells usually receive equal amounts of cytoplasm as parent cells undergo cytokinesis. Which of the following is an exception?
Asexual reproduction by budding in yeast
Bacterial cell division
Cloning of lymphocytes during an immune response
Formation of a zygote during fertilization
The image shows a cell in the anther of a lily (Lilium sp.) plant during the first division of meiosis.
Outline the reason for diploid organisms producing haploid cells by meiosis.
Which is a characteristic of the pairs of sister chromatids that are visible during meiosis?
They result from the replication of DNA before meiosis.
They are only present in meiosis I.
They split apart during metaphase I in meiosis.
They are only present in meiosis II.
What occurs in cell division during both mitosis and meiosis?
Condensation of DNA by supercoiling in telophase
Movement of microtubules to move chromatids in anaphase
Pairing of homologous chromosomes in prophase
Crossing over between chromosomes in metaphase
The micrograph shows cells dividing by mitosis in the root tip of an onion (Allium cepa).
Which change would take place in cell Y if mitosis was allowed to continue?
Splitting of centromeres
Formation of spindle fibres
Supercoiling of chromosomes
Separation of homologous pairs
The micrograph shows onion (Allium cepa) root tip cells dividing by mitosis.
In which phase is cell Z ?
Interphase
Prophase
Metaphase
Anaphase
What occurs during the first division of meiosis?
Replication of DNA
Separation of chromatids
Halving of the chromosome number
Production of two identical cells
There is no evidence that rates of non-disjunction in meiosis increase as the age of the father increases from 30 to 45, yet the frequency of Down syndrome in offspring increases. What could explain this?
Down syndrome is not caused by non-disjunction.
Meiosis rates decrease in males between the ages of 30 and 45 .
Down syndrome is sex-linked, so non-disjunction can only take place in the mother.
Rates of non-disjunction increase as the age of the mother increases, and parents of a child tend to be similar in age.
During which stage of meiosis does crossing over usually occur?
Prophase I
Metaphase I
Prophase II
Metaphase II
Both the genome and the environment of an organism affect its growth and development. Variation between individuals of a species can be continuous or discrete (discontinuous). Mitosis produces identical cells for growth and meiosis allows for variation.
The micrographs show onion and whitefish cells in mitosis.
Identify the phase of mitosis labelled X .
The process of cytokinesis is occurring in the whitefish embryo cells. Explain how cytokinesis occurs in this animal cell.
