Biology Essentials- Reproductive Isolation and Speciation Guided Viewing Worksheet
1: What happened with Diane Dodd and the fruit flies? How did she create reproductive
isolation?
Diane took a group of fruit flies and then fed them different things. Some with starch and some with maltose. After 8 generations, the flies breeded with ones that ate only what they ate. This created reproductive isolation because it gave the fruit flies a barrier.
2: What is the definition a species?
A group of organisms that can inner breed with each other.
3: What are the two main types of barriers in reproductive isolation?
geographic and post-zygotic
4: What is gene flow? What is reproductive isolation?
Genes a mix of genes in a population. A species that can't have gene flow.
5: What is geographic isolation? (Give an example).
Isolation is population due to where they are.
Ex: an ice age broke apart a species because ice melted in between them.
6: What is allopatric speciation? (give an example)
When they live in different lands.
Ex: an ice age broke apart a species because ice came in between them.
7: What is sympatric speciation? (give an example)
When they live in the same lands and something happens between the population.
ex: Plants can have a mistake in a number of chromosomes
8: What is peripatric/parapatric speciation? (give an example)
One group would live in another area and reproduce.
Ex: The african and pigmy elephants.
9: What are pre-zygotic barriers? Name the types of pre-zygotic barriers (explain each).
(Temporal, Mechanical, Behavioral)
Pre-zygotic barriers are barriers that are created before a zygote is formed.
temporal: two species will breed at different times
mechanical: sex parts can't get next to each other
behavoiral: behaviors are different between two species
10: What are post-zygotic barriers? Name the types of post-zygotic barriers- give examples.
(Zygote Mortality, Hybrid Sterility)
Post zygotic barriers are where the sperm and egg will get together but the zygote may die.
zygote mortality ex: a coral's sperm will move to another. The zygote will get fertilized but will die.
Hybrid sterility ex: horses and donkeys breed but the offspring cannot produce anymore offspring.
11: What is polyploidy? What happens? Where is this common?
Polyploidy is very fast speciation. This happens when there is a mistake in the number of chromosomes and is very common between plants.
12: What is the theory of Punctuated Equilibrium?
This says that speciation is very quick over time.
isolation?
Diane took a group of fruit flies and then fed them different things. Some with starch and some with maltose. After 8 generations, the flies breeded with ones that ate only what they ate. This created reproductive isolation because it gave the fruit flies a barrier.
2: What is the definition a species?
A group of organisms that can inner breed with each other.
3: What are the two main types of barriers in reproductive isolation?
geographic and post-zygotic
4: What is gene flow? What is reproductive isolation?
Genes a mix of genes in a population. A species that can't have gene flow.
5: What is geographic isolation? (Give an example).
Isolation is population due to where they are.
Ex: an ice age broke apart a species because ice melted in between them.
6: What is allopatric speciation? (give an example)
When they live in different lands.
Ex: an ice age broke apart a species because ice came in between them.
7: What is sympatric speciation? (give an example)
When they live in the same lands and something happens between the population.
ex: Plants can have a mistake in a number of chromosomes
8: What is peripatric/parapatric speciation? (give an example)
One group would live in another area and reproduce.
Ex: The african and pigmy elephants.
9: What are pre-zygotic barriers? Name the types of pre-zygotic barriers (explain each).
(Temporal, Mechanical, Behavioral)
Pre-zygotic barriers are barriers that are created before a zygote is formed.
temporal: two species will breed at different times
mechanical: sex parts can't get next to each other
behavoiral: behaviors are different between two species
10: What are post-zygotic barriers? Name the types of post-zygotic barriers- give examples.
(Zygote Mortality, Hybrid Sterility)
Post zygotic barriers are where the sperm and egg will get together but the zygote may die.
zygote mortality ex: a coral's sperm will move to another. The zygote will get fertilized but will die.
Hybrid sterility ex: horses and donkeys breed but the offspring cannot produce anymore offspring.
11: What is polyploidy? What happens? Where is this common?
Polyploidy is very fast speciation. This happens when there is a mistake in the number of chromosomes and is very common between plants.
12: What is the theory of Punctuated Equilibrium?
This says that speciation is very quick over time.