Answer:
This statement is false. It is often not possible for speciation to be predicated as speciation of species depends on its habitat and interaction with other organisms in the habitat as well as the ever-changing environmental factors. It is thus very hard to model possible speciation that could happen.
Explanation:
Explanation:
-function
Cells are the basic microscopic units of all organisms. There are two cell types:
- Prokaryotic ( meaning ➡️ pro: before and Karyon: for kernel/nut) describes organisms which don’t have a cell nucleus or other organelles surrounded by membranes.
- Eukaryotic (eu meaning true), are organisms with a cell nucleus and several other organelles surrounded by membranes.
- Example prokaryotes do not contain: nuclei , Golgi apparatus, chloroplasts, mitochondria
Both may contain a cell wall (seen in eukaryotic fungi and plant cells)
Their structural components (i.e. their makeup) determine their function (what they do) . For instance, photosynthesizing cells in algae and plants have structures called chloroplasts. These contain chlorophyll, a specialized compound which facilitates the conversion of light energy to energy stored in carbohydrates.Organisms, are either unicellular (single- celled) or multicellular (many celled).
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I am tempted to say that the nervous system processes the stimuli, or to be more specific, the neurons that go across our nervous system.
Answer:
Failure of chromosome to separate
Explanation:
The main essence of meiotic division is to form daughter cells with a reduced number of chromosomes that will maintain the correct chromosomal number in an organism. This is achieved when chromosomes separate during gamete formation (meiosis) to produce haploid (n) gametes.
However, a case may arise whereby chromosomes fail to separate during the anaphase stage of meiosis. This case is referred to as MEIOTIC NON-DISJUNCTION. As meiosis occurs in two stages i.e. meiosis I and II, so does meiotic nondisjunction. It can occur in meiosis I, where homologous chromosomes fail to separate or meiosis II, where sister chromatids fail to separate.
If it occurs in meiosis I, Two gametes will have a n-1 chromosome number i.e. one chromosome is missing while Two other gametes will have n+1 chromosome number i.e. one extra chromosome is added.
If it occurs in meiosis II, two normal haploid gametes (n) will be produced while the other two will have a n+1 and n-1 chromosome number respectively.
When these abnormal gametes (n+1, n-1) fuses with a normal gamete (n), the resulting organisms possess a chromosomal anomaly called ANEUPLOIDY i.e. a disorder in chromosomal number. The organisms will have 47 and 45 chromosomes depending on whether n+1 or n-1 gametes is involved respectively.
