Unit: Biology Name:________________________ Lesson 2: Sexual Reproduction Date: _________________________

Sexual Reproduction

Sexual Reproduction

1. Recall that sexual reproduction occurs when one haploid – the ____________ – fuses together with another haploid – the ___________.

2. Each haploid contains ______ chromosomes.3. When they combine they produce a ________________ (an offspring) with _______

chromosomes – or ________ pairs of chromosomes. 4.

Advantage Disadvantage

Twins

5. Identical Twins -

Fraternal Twins -

Conjoined Twins -

Hermaphrodites

6. A _____________________ is an organism that produces both ___________ and ____________ sex cells.

Unit: Biology Name:________________________ Lesson 2: Sexual Reproduction Date: _________________________

7. Hermaphrodites can mate with any other member of its species, usually is ______________ fertilize their own eggs with their own sperm.

8. _______________ and ___________________ are examples of hermaphrodites.

Earthworms

9. When they meet, they attach to each other and fertilize __________________eggs. 10.They create a ___________________ called the _______________ - this can be found

around the thicker part of the worm. 11.The mucus ring will slip off the worm into the soil and act as a ________________ for

the fertilized eggs. The offspring will hatch in a few days. 12. After fertilization they will ______________ from each other.

Flowering Plant

13. Stamen -

Pistil -

14. Filament -

Anther -

Pollen -

Stigma -

What does the pollen travel down?

What does the pollen fuses to the eggs in the ______________ to create a zygote.

Unit: Biology Name:________________________ Lesson 2: Sexual Reproduction Date: _________________________

15. How does pollen move from one plant to another?

16. The pollen then _________________ the eggs in the ovary. The eggs turn into _________________ that ________________ into the soil and grow.

Internal Fertilization

17. In this form of reproduction, sperm is _____________________ inside the female in order to fertilize the egg.

18.The ________________ develops inside the mother until birth.

Mammals

19. Mammals –

20. Examples of mammals are –

Reptiles and Birds

21. Reptiles and Birds –

22. Examples ofReptiles - Birds –

23. They have ________________ fertilization, but after fertilization occurs they _______ their eggs and let the egg incubate.

Advantage and Disadvantage of Internal Fertilization

Advantages Disadvantages

Unit: Biology Name:________________________ Lesson 2: Sexual Reproduction Date: _________________________

External Fertilization

24.This is where the egg and the sperm cell unite ______________ the bodies of parents.25.The female ____________ the eggs and the male ______________ it out in the open. 26.The eggs are ___________________ to the external environment.

Fish and Amphibians

27. Fish and amphibians spend all, or most of, their lives in the ____________.28.They have external fertilization. The ______________ will fertilize the eggs after the

____________ has released them. 29. Examples of

Fish - Amphibians -

Advantage and Disadvantage of External Fertilization

Advantages Disadvantages