Unit 3 - Ch 10 - Reproduction

Question 1

Asexual reproduction:

Answer 1

Involves one parent

Question 2

Advantages to asexual reproduction (3)

Answer 2

1. Usually rapid
   - E. coli (20 minutes)
   - generation time is short
2. Little/No specialization for reproduction
   - saves energy
3. Preserves genetics
   - produce a clone of the parent
   - beneficial if the environment is stable

Question 3

What are the ways and examples that asexual organisms reproduce?
(4)

Answer 3

1. Fission
   - organism divides in half
   - parent is not retained
   = paramecium fission
2. Budding
   - small offshoot offspring
   - parent is retained
   = Hydra Budding
3. Fragmentation
   - a portion is used to reproduce
   = algae, cacti, starfish
4. Vegetative Propagation
   - common in plants = strawberry runners

Question 4

Sexual reproduction:

Answer 4

Involves two parents - offspring receives information from each parent

Question 5

characteristics of Haploid gametes

Answer 5

Present in sexual reproduction

• (n)
• contain one of every chromosome
• no homologous pairs
  = in humans n=23

Question 6

Characteristics of Diploid zygotes:

Answer 6

Present in sexual reproduction

• (2n)
• contain two of every chromosome
• homologous pairs present
  = in humans 2n=46

Question 7

Advantages to sexual reproduction (2)

Answer 7

1. Provides variation
   - may be beneficial if the environment is changing
2. Reduces impact of detrimental mutations
   - by a 50% chance