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joelle

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Posts posted by joelle

  1. i wrote this..

    Chromosomes of a gamete would not be used to produce a karyotype because they do not show homologus pairs which are needed to show different traits that an individual has. Examples of these traits include: eye colour, and height. They also do not show the sex of an individual (unless the chromosome shown is Y then it is a male) because one sex chromosome comes from the mother and one comes from the father. Somatic cells on the other hand show homologus pairs of chromosomes.

  2. a. Sieve-tube cells lack a nucleus, are arranged end to end and have channels in end walls (thus,

    the name "sieve-tube") through which plasmodesmata extend from one cell to another.

    b. Companion cells connect to sieve-tube cells by numerous plasmodesmata, are smaller and more

    generalized than sieve-tube cells; they have a nucleus.

     

     

    is that right? like about how they connect to compannion cells who have a nucleus?

  3. Mature phloem cells lack a nucleus. If the nucleus is the control center of the cell, how are there cells controlled?

     

    i dont get that question

     

    wouldnt it just not function withoutt a nucleusss?

    im lost

  4. i read thatt already, but thankss soo much

    i still dotn get it its only worth 2 marks i was told that

     

    in one, when corsssectioned, the xylem is arranged in a circle

    in the other they're scattered

     

    is that truee?

     

    and if soo which one are they scattered

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