Reproduction And Development Worksheets printable pdf download

Reproduction And Development Worksheets

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REPRODUCTION & DEVELOPMENT

I. CHROMOSOMES –

rod shaped structures in nucleus



consist of genes which contain genetic information (DNA)



sex chromosomes – determine sex of an organism

a. EGGS = X

SPERM = X or Y

b. FEMALE = XX

MALE = XY

II. CELL DIVISION

MITOSIS:

1 cell  2 cells



daughter cells have the SAME # OF CHROMOSOMES as parent cell



production of ALL body cells EXCEPT sex cells

MEIOSIS :

2 divisions (1  2  4)



for sexual reproduction



4 new daughter cells with ½ the number of chromosomes as parent cell



TO PRODUCE SEX CELLS ONLY (in ovaries & testes)

III. ASEXUAL REPRODUCTION

1 parent, offspring identical to parent, carried out by mitosis

TYPES OF ASEXUAL REPRODUCTION

1. FISSION – one-celled organism divides into 2 identical cells (ameba and paramecium)

2. BUDDING – unequal division of organism (Yeast)

3. SPORULATION – spores (specialized cells) develop into new organism (mold, mushrooms)

4. VEGETATIVE PROPAGATION – used by plants (NO SEEDS)

-runners (strawberries), buds/tubers (potatoes), grafting (roses), bulbs (onions)

IV. SEXUAL REPRODUCTION



2 parents, each give sex cell



Offspring NOT identical to parents (VARIATIONS OF OFFSPRING)



FERTILIZATION = SPERM +

EGG  ZYGOTE



ZYGOTE DEVELOPS INTO EMBRYO (1

8 weeks)  FETUS



Fertilization

zygote

mitosis (cell division)

blastula

gastrula

VI. METAMORPHOSIS



A change in the form and often habits of an animal during normal development after the embryonic

stage.



Metamorphosis includes, in insects, the transformation of a maggot into an adult fly and a

caterpillar into a butterfly and, in amphibians, the changing of a tadpole into a frog.

Reproduction And Development Worksheets

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