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Flashcards in Notes Deck (13):
1

Sexual reproduction

2 different parents are required
Mixing of 2 sets of DNA
Offspring are always different from parents-genetic diversity
Process of bringing nonidentical gametes together

2

Mating

Members of the opposite gender come together at a certain time of the year to reproduce/mate; during the most favourable time of the year to ensure the best possibility for survival of the offspring (food, climate, temperature, weather, etc.)

3

Fertilization

Gametes come together to form a zygote which becomes an embryo

(Only one sperm to combine with egg/ovum-insures the correct amount of chromosomes)

4

Conditions for cell division

Nutrients
Temperature
Moisture

5

Advantages of external fertilization

Little energy used to find a mate

Large number of offspring is produced

6

Disadvantages of external fertilization

Most young will die

Unprotected

Parents abandon offspring

7

Advantages of Internal fertilization

Developing young are protected inside parent

Greater parental care

Fewer zygotes

8

Disadvantages of internal fertilization

Fewer offspring

9

Developlement

Zygote divides to form embryo through mitosis

10

Embryonic developlement

Early development of an organism

11

Morula

After the first week of cell division (week 1)
Ball of cells

12

Blastula

After the 2nd week which forms a hallow ball

13

Gastrula

Three layers of cells form-stem cells start to differentiate into specialized cells