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Advanced Higher
Unit 2 - Variation and Sexual Reproduction
Question | Answer |
---|---|
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 |