What is pachytene stage.????
Answers
Answer:
● Pachytene stage..
> During this stage bivalent chromosomes are clearly appears as tetrad.
> This stage is characterised by the appearance by Recrimination nodule.
Recombination nodule:- The sites at which crossing over occurs between two homologous chromosomes.
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In the more advanced animals, there are usually 10 organ systems: integumentary, skeletal, muscular, nervous, endocrine (hormonal), digestive, respiratory, circulatory, excretory, and reproductive. These systems appear gradually in the lower animals and attain their full complexity and functional specialization in the higher animals. In plants the primary organs are the stem, root, and leaf, all of which help to nourish the plant, and the reproductive organs (e.g., flowers, seed, and spores). As with animals, these organs are responsible for the basic life-sustaining functions of the organism is called the pachytene stage.