Question

Define the terms ÷
i] Prophase
ii] Spireme Stage
iii] Astral rays
iv] Aster ​

Answer 1

Answer:

Prophase-the first stage of cell division, before metaphase, during which the chromosomes become visible as paired chromatids and the nuclear envelope disappears. The first prophase of meiosis includes the reduction division.

Explanation:

Spireme Stage - (spī'rem, spī'rēm), Term formerly applied to the first stage of mitosis or meiosis (prophase) during which extended chromosome filaments have the appearance of a loose ball of yarn, on the incorrect supposition that the filaments were continuous and later broke apart

Astral rays-Astral rays, composed of microtubules, radiate from the centrosphere and look like a cloud. Astral rays are one variant of microtubule which comes out of the centrosome; others include kinetochore microtubules and polar microtubules.

aster-Aster is a genus of perennial flowering plants in the family Asteraceae. Its circumscription has been narrowed, and it now encompasses around 180 species, all but one of which are restricted to Eurasia; many species formerly in Aster are now in other genera of the tribe Astereae.

Answer 2

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i] Prophase - Prophase is the first phase of karyokinesis in which chromatin fibres condense to form chromosomes.

ii] Spireme Stage - Spireme stage is the stage of early prophase in which the chromosomes overlap one another with their ends not discernible as yet.

iii] Astral rays - Astral rays are radiating microtubular fibrils which appear around the centriole pair in dividing animal cells.

iv] Aster - Aster is a star - shaped complex consisting of a centriole pair and radiating astral rays found at the polar end of the spindle in dividing animal cells.