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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
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