Question

Drag the terms to complete the concept map below. Resethelp meiosis iimeiosis ii crossing over occurscrossing over occurs sister chromatids separatesister chromatids separate diploid organismsdiploid organisms maternal chromo- somesmaternal chromo- somes haploid gameteshaploid gametes

Answer 1

Explanation:

Sexual reproduction requires fertilization, a union of two cells from two individual organisms. If those two cells each contain one set of chromosomes, then the resulting cell contains two sets of chromosomes. The number of sets of chromosomes in a cell is called its ploidy level. Haploid cells contain one set of chromosomes. Cells containing two sets of chromosomes are called diploid. If the reproductive cycle is to continue, the diploid cell must somehow reduce its number of chromosome sets before fertilization can occur again, or there will be a continual doubling in the number of chromosome sets in every generation. So, in addition to fertilization, sexual reproduction includes a nuclear division, known as meiosis, that reduces the number of chromosome sets.

Most animals and plants are diploid, containing two sets of chromosomes; in each somatic cell (the nonreproductive cells of a multicellular organism), the nucleus contains two copies of each chromosome that are referred to as homologous chromosomes. Somatic cells are sometimes referred to as “body” cells. Homologous chromosomes are matched pairs containing genes for the same traits in identical locations along their length. Diploid organisms inherit one copy of each homologous chromosome from each parent; all together, they are considered a full set of chromosomes. In animals, haploid cells containing a single copy of each homologous chromosome are found only within gametes. Gametes fuse with another haploid gamete to produce a diploid cell.

Answer 2

Meiosis I and  Meiosis II  

Explanation:

Phase of Meiosis  

• The cell experiences similar stages and uses comparative process to arrange and separate chromosomes
• In meiosis, the cell has needs to isolate sister chromatids (the two parts of a copied chromosome), as in mitosis.The isolate homologous chromosomes, the comparative however nonidentical chromosome combines a life form gets from its two parents
• Homologue sets separate during a first round of cell division, called meiosis I
• Sister chromatids separate during a second round, called meiosis II  

Meiosis I   - Meiosis I, a cell should initially experience interphase. As in mitosis, the cells develops during G1 stage  .G1 phase subscript, 1, end subscript phase, duplicates the entirety of its chromosomes during S stage, and gets ready for division during G2 stage  , where is homologous chromosomes exchange parts, is brought traverse. It's aided along by a protein structure called the synaptonemal complex that holds the homologues together  

Meiosis II - The cells that enter meiosis II are the ones made in meiosis I.These cells are haploid have only one chromosome from every homologue pair yet their chromosomes despite everything comprise of two sister chromatids. In meiosis II, the sister chromatids isolated, making haploid cells with non-copied chromosomes. In metaphase II, the chromosomes line up separately along the metaphase plate. In anaphase II, the sister chromatids independent and are pulled towards inverse posts of the cell