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tatuchka [14]
3 years ago
8

HELP MEH! I'LL GIVE BRAINLIEST, 5 STARS, AND THANKS!

Biology
2 answers:
Inga [223]3 years ago
8 0

Answer: Each chromosome actually consists of two sister chromatids, which are joined together at a centromere. ... During this process, sister chromatids separate from each other and move to opposite poles of the cell. This happens in four phases, called prophase, metaphase, anaphase, and telophase. Homologous chromosomes are two pieces of DNA within a diploid organism which carry the same genes, one from each parental source. In simpler terms, both of your parents provide a complete genome. Each parent provides the same 23 chromosomes, which encode the same genes. Sister chromatids are two identical copies of the same chromosome formed by DNA replication, attached to each other by a structure called the centromere. During cell division, they are separated from each other, and each daughter cell receives one copy of the chromosome.  Spindle fibers are filaments that form the mitotic spindle in cell division, i.e. mitosis and meiosis. They are chiefly involved in moving and segregating the chromosomes during nuclear division. Spindle fibers are made up of microtubules.  In meiosis. Each pair of chromosomes—called a tetrad, or a bivalent—consists of four chromatids. At this point, the homologous chromosomes exchange genetic material by the process of crossing over (see linkage group). The tetrad occurs during the first phase of meiosis. It is the foursome of chromatids that forms when replicated homologous chromosomes align. It must be formed for crossing over to occur. It is broken apart when the homologous chromosomes separate in meiosis I.

Explanation:

klasskru [66]3 years ago
8 0

Answer:

Explanation:

Meiosis consists of two main parts, part I and part II.

Here is a link that describes each phase in detail (you can just find the parts with the words you need)

Mitosis (I included a picture of the cell cycle) Also two main parts, Interphase and Mitosis

(there is a video that The Amoeba Sisters put up on both Meiosis and Mitosis...they explain every step and summarize it for you...you can also look at the transcript of the video to just copy and paste)

Interphase

G1- Growth

S-When DNA is replicated

G2-more growth and checking the replicated DNA for errors

Mitosis

Prophase

Metaphase

Anaphase

Telophase

Download pdf
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