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Advanced Higher

Unit 2 - Variation and Sexual Reproduction

QuestionAnswer
State the costs of sexual reproduction Males cannot produce offspring; only half of each parents genome passed on this disrupts successful parent genomes
State the benefit of sexual reproduction Increase in genetic variation
Variation is important as it provides the raw materials to ... Organisms to keep running in the Red Queens arms race
State which conditions favour asexual reproduction Narrow stable niches and (recolonising) disturbed habitats
Plant asexual reproduction Vegatative cloning
Animal asexual reproduction Parthenogenesis
State why asexual reproduction is a successful reproductive strategy Successful genome is passed on
Where is parthenogenesis most commonly found? Cooler climates and regions of low parasite density
Which organisms principally use asexual reproduction? Bacteria and archaea
Explain why asexual reproduction is cost effective. Metabolic costs are lower and the production of offspring can be rapid
Discuss the cost effectiveness of sexual reproduction Metabolic costs are higher and the reproduction rate is much slower
Give an example of vegatative cloning Bulbs, tubers, stolons
Which mechanism is used by bacteria to successfully transfer genes in the same generation Horizontal gene transfer
What is meant by the term hermaphroditic? Has both male and female parts/sex organs
What term describes the mode of asexual reproduction where offspring arise from an unfertilised egg? Parthenogenesis
Created by: StNiniansHS