Unit 3 Topic 1
What term describes the number of different species in an ecosystem?
Species richness
What term describes an organism that makes its own organic compounds?
Producer / autotroph
What molecule carries genetic information?
DNA
What is a change in allele frequency within a population called?
Microevolution
What sampling method uses a square frame placed within a habitat?
Quadrat sampling
What trophic level contains organisms that eat producers?
Primary consumers
What type of cell division produces gametes?
Meiosis
What evolutionary process favours one extreme phenotype?
Directional selection
A quadrat contains 8 grass plants in an area of 2 m². Calculate the density.
4 plants/m²
Producers contain 10 000 kJ of energy and primary consumers receive 1 000 kJ. Calculate the percentage energy transfer.
10%
A DNA strand contains 30% adenine. What percentage is thymine?
30%
A population contains 20 AA, 20 Aa and 10 aa. Calculate the frequency of allele A.
0.60
40 animals are marked. Later, 50 are captured and 10 are marked. Estimate the population size.
200 animals
What term describes the maximum population size an environment can sustainably support?
Carrying capacity
What enzyme joins DNA fragments together during DNA replication?
DNA ligase
What type of speciation occurs when a physical barrier separates populations?
Allopatric speciation
A community contains 6 species. What measure of biodiversity does this value represent?
Species richness
GPP = 8 000 kJ and respiration = 3 000 kJ. Calculate NPP.
5 000 kJ
What type of mutation occurs when one nucleotide is added to a DNA sequence?
Insertion
Two species have 2 differences in a conserved sequence, while another pair has 15. Which pair is likely more closely related?
The pair with 2 differences