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11-4 Meiosis
Genetics
Name: ___________________________
The chromosomal theory of inheritance states that _______________ are located in
specific positions on _________________________. Mendel’s principles of genetics
require two things:
1.
2.
Chromosome Number – Fruit flies have _____ chromosomes in their body cells (1 set
of 4 from their female parent and 1 set of 4 from their male parent). The two sets of
chromosomes are ______________________, matching pairs of chromosomes. A cell
that contains both sets of homologous chromosomes is said to be ________________,
sometimes represented by the number 2N.
Sex cells or gametes contain only a single set of chromosomes and are said to be
__________________ (1 set of genes), represented by N.
Phases of Meiosis – produces haploid (N) gametes from _____________ (2N) cells.
Meiosis is a process of _______________________ division in which the number of
chromosomes per cell is cut in half through the separation of ______________________
chromosomes in a diploid cell. Meiosis involves _____ divisions, meiosis I and meiosis
II. By the end, one diploid cell will become _____ haploid cells.
Before meiosis occurs, each chromosome is _________________ (interphase).
Meiosis I
Prophase I – Each chromosome pairs with its corresponding homologous chromosomes
to form a _______________. In a process called ________________________________, the homologous chromosomes exchange portions of their chromatids (Fig.
11-16).
Metaphase I –
Anaphase I –
Telophase I and Cytokinesis –
Meiosis II
Prophase II –
Metaphase II –
Anaphase II –
Telophase II and Cytokinesis –
Gamete Formation
Male gametes –
Female gametes –
Comparing Mitosis and Meiosis
Mitosis results in the production of _____ genetically identical _______________ cells,
whereas meiosis produces ____ genetically different ________________ cells.