Instructions

Cellular Reproduction and Division

Cell division serves three functions: (1)._______ , (2)________ and (3) _____ .

(5) ________ is a reproductive cell (egg or sperm) with
23 chromosomes

(4) _______ in gonads
halves the chromosome number

A (6) _______ cell is a body cell.

(7) _______ produces genetically identical cells. Process is responsible for growth, development and repair

1

A. Introduction
a. Types of Cell Division

i. (1) _______ – division of the nucleus in eukaryotic cells which conserves the original chromosome number

1. Used for

a. b. c.

(2) ____ ______ (increasing the number of cells) (3) ____ ______
(4) ______ ___________

ii. (5) _______ – cell division that results in cells containing (6) ____ the chromosome number of the original parent cell, also known as reduction division

1. Used for
a. (7) ______ reproduction

b. (8) ______ production

  1. Asexual vs Sexual Reproduction
  2. Chromosome Structure
    (17) ____ – nucleic acid composed of A, T, G C Chromosome composition – (18) ___ & _______.
    (19) _________ – extended chromosomes in the form of long, thin fibers not visible under light microscope (20) _______________ – condensed chromosomes so compacted that they can be visible under light microscope (21) ____ – Unit of hereditary information made of DNA and located on a chromosome. Most program cells to produce (22) _______. (23) _________ – One of two identical strands of a duplicated chromosome (24) _________ – region of a chromosome joining sister chromatids (25) ____ – positions (locations) of genes on a chromosome
    (26) _______– Different forms of a gene (tall vs short, for example)
Asexual ReproductionSexual Reproduction
Number of parents(9) ___(10) ___
Offspring genetic similarities?(11)___________ _______(12) __________ ______
How much genetic variation?(13) ______ __ ____(14) _ ___
Type of Cell Division(15) _______   (16) _______

2

d. Binary Fission in Prokaryotic Cells
§ The process of cell division in prokaryotic cells is

called (1) ______ _______.

  • § Lack membrane bound organelles
  • § Have no nuclear membrane
  • § Generally have a circular chromosome located in the (2) ________ ______.

The chromosome begins to replicate at the (3) ______ __ __________.

The duplicated origins move to ( 4) ________ _____ of the cell,

separating the chromosome as it replicates

As replication occurs the cell Is increasing in size.

i

n c r e a s i n g i n s i z e

3

The Cell membrane pinches in and a cross wall forms

Two (5) _________ ________ _____ form from the original cell

Cell Cycle

(1) ____ _____ is the life of a cell from the time it forms until the time it divides.
Phases of the cell cycle:

1. (2)__________-90%ofcellcycle.Thecellgrows and prepares for division. It is divided into:

  1. a) (3) __ (First Gap)-Cell grows and prepares for replication of chromosomes
  2. b) (4) __ (Synthesis)-Chromosome replication. After this point the replicated chromosome consist to two sister chromatids joined at the centromere
  3. c) (5) __ (Second Gap)-Cell Grows and prepares for division

2. Mitosis-divisionofthecell.Itisdividedinto:

a) (6) _______-separation of the chromatids (prophase, prometaphase, metaphase, anaphase and telophase)

b) (7) ________-separation of the cytoplasm between the two daughter cells

4

Production of Gametes

• Meiosis produces (1) ____ _________ _____ _____ in spermatogenesis

• Oogenesis

  • Meiosis begins in the (2) ______ and is arrested in prophase I
  • Cytokinesis is (3) _______, producing a (4) _________ ______ ____ __ _____ ____.
  • Meiosis II is not completed until the (5)_________ ______ is fertilized
  • Cytokinesis is (6) _______, producing an (7) ___ (ovum) and a (8) ______ _____ ____.
  • At birth, the ovary of a female contains a life time supply of primary oocytes that are (9) ________ __ ________ __ of meiosis.

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