Genetic information, variation, and relationships between organisms Flashcards
why is using diversity index better than species richness?
diversity index explores the number of different species and number of individuals in each species
species richness only looks at the number of species and some species may only be present in small numbers
why does food production lower species diversity of plants?
other species are being removed when being harvested
some species are better competitors for light
why does food production lower species diversity of animals?
lower variety of habitats
lower variety of food sources
define genetic diversity
different alleles of each gene
define founder effect
When a small proportion of a population leave and isolate themselves
They inbreed and reduce the gene pool
define genetic bottleneck
Caused by a circumstance which kills a large portion of population and reduces the gene pool
the importance of courtship behaviour?
- formation of a pair bond
- synchronises mating
- indication of sexual maturity
- attraction of the same species
- attraction of the opposite sex
what is the effect of genetic bottleneck or founder effect on inheritance?
causes the gene pool to be smaller
individuals in the group breed with each other
high chance of inheriting a particular allele
what’s the benefits of conservation of habitats?
Conserving/protecting habitats/niches;
Conserving endangered species OR maintains (bio)diversity;
Source of medicines/chemicals/wood;
Reduces erosion/eutrophication
in what ways can crop rotation lead to higher yield of crops
different plants have different minerals
grow crops using nitrogen fixing bacteria
different crops have different pests
How does meiosis produces genetic diversity
Homologous chromosomes arrange
Haploid cells
Allows different combinations of maternal and paternal chromosomes
