Download Asexual vs - TeacherWeb

Asexual vs. Sexual Reproduction
#89
Name KEY
Standard 9: Compare sexual re-production (offspring inherit half of their genes from each parent) with
asexual reproduction (offspring is an identical copy of the parent’s cell).
1. Fill in the chart below
Sexual Reproduction
Definition
•Involves sex
cells and fertilization •Does not involve sex cells and
fertilization
• DNA from _2 parents
Advantages/
Disadvantages
Asexual Reproduction
•Offspring are not genetically
identical to one another
•There is __variation in the
•Only _1 parent plant genetically
•Offspring have no _variation
•Offspring are genetically identical to one
another
offspring
A. ASEXUAL REPRODUCTION
IN PLANTS
2. Vegetative propagation (in plants) is when new plants develop from ______roots_______,
______stems__________, or __________leaves___________ of parent plants.
3. Tubers: thickened, underground
____stems_____
Example: _potatoes, artichoke, dahlia
Sketch tubers to the right:
4. Bulbs: similar to tubers
Can be separated
Examples: daffodils, lilies, tulips
Sketch bulbs to the right
5. Runners: side shoots that grow
out of parent plant
Buds form along _runner
And grow roots to make new plant.
Examples: strawberry, spider plant
Sketch to the right
6. Artificial propagation: making
more of the same plant
7. Cuttings: small pieces of stem
with some leaves attached, the new
plant grows from this.
Can use rooting powder to get cuttings
started.
Sketch to the right:
8. Grafting: A cut stem of one plant with good
flower or fruit growth (the __graft_) is
taken and firmly attached to the rootstock
of another plant which has a strong,
established root system. (the __stock__).
Examples: _roses, fruit trees
Sketch to the right
Benefits: Quick production of large numbers
of genetically identical plants. Specific varieties, desired features or consistent quality can be produced
especially in fruit, flowers.
IN ANIMALS & FUNGI
9. Parthenogenesis: development of an egg into an _____embryo_____without fertilization.
About ____% of animals use parthenogenesis. A smaller number switch between sexual reproduction
and asexual reproduction.
Examples: Komodo dragon, bonnethead shark, water flea, Bynee’s gecko, grasshopper, Mulga tree
Why parthenogenesis? _lack of mates
Why sexual reproduction during tough times? Sexual reproduction produces more variation in
offspring, so some may have the genes needed for
survival
10. Regeneration: the ability of some animals to
__regrow___________ severed parts.
Some of these animals can also grow whole new
___organisms___________ from the severed
pieces.
Examples: brittle stars, flatworms (planaria)
11. Why regeneration? (they can also reproduce sexually) _to escape attacks
12. Budding: the parent cell or body gives out a
lateral outgrowth called the _bud_ which then falls
off and germinates into a new individual.
Bud is smaller than parent but then grows to adult size.
Example: hydra; yeast___
Sketch the hydra budding to the right.
In Bacteria & Protists
13. Binary fission: copying DNA then splitting
into _2_ equal sized cells.
Examples: bacteria, amoeba
Sketch both bacteria and amoeba
B. SEXUAL REPRODUCTION
DNA comes from __2_ parents.
Formed by gametes: _egg__/__sperm__
Advantage: genetic diversity to handle a
Variety of situations.
Examples: animals, plants
Sketch egg/sperm and flower