Topic 3 – Passing it on  Sexual Reproduction
Sexual Reproduction
 Definition:
 Reproductive process involving two sexes or mating types and resulting in a
combination of genes
 Offspring Looks like?
 Both parents supply genetic material so the offspring will display a combination
of both parents
 Organism Examples:
 Plants, Animals
 Advantages:
 Get a variety of living things
 Disadvantages:



What happens?
 Sexual reproduction combines:
 TWO _________________________ (sex cells = sperm, egg) to form
 ONE _________________________ (fertilized cell = a new individual).
Bacterial Conjugation
 __________________________________ is a PRIMITIVE form of sexual reproduction.
 Two parents are still involved.
 In bacterial conjugation, a connection is formed between two cells.
 A one-way transfer of genetic material from one cell to another can then occur
Diagram:
Sexual Reproduction in Plants
 The female reproductive part of the plant is called the __________________________
 It consists of:
 Ovary, Style, Stigma
 The male reproductive part of the plant is called the ___________________________
 It consists of:
 Anther, Filament
 The ____________________ contains the female gamete
 The ___________ contains the male gamete
Steps to Pollination
1.
2.
3.
4.
5.
Label the Diagram
Sexual Reproduction in Plants
 Plants have diverse reproductive strategies
 35,000 spore bearing
 700 species are gymnosperms (produce seeds in cones)
 200,000 species of angiosperms (flowering plants)
 Some are _________________________ and some are ____________________________
Definition
Self Pollination
- male and female gamete
comes from the same plant
Cross Pollination
- Male and female gametes
come from different plants
Advantage
Disadvantages
Avoiding Self Pollination
 Stamen and pistils mature at different times
 Stamen is shorter than pistils
 Wind-pollinated flowers usually bear the pistil and stamen in separate flowers
 Some have pistil and stamens on different parts of the same plant (corn)
Sexual Reproduction in Animals
 For sexual reproduction to be successful:
 Male and female gametes must arrive at the same time at the same place
 Zygote requires specific conditions to develop nutrients
 Moisture
 Warmth and Protection
External vs. Internal Fertilization
External
Internal