What does P, F1 and F2 mean?
When displaying crossings between two parental organisms, the resulting offspring are referred to as F1. If those offspring are crossed between themselves, the resulting generation is called F2….
Heterosis: the patterns and genetic basis
Heterosis is the phenomenon whereby first generation (F1) hybrids have higher trait values than their parents (Charlesworth and Willis 2009). These F1 hybrids can be produced by parents…
Estivation in desert mammals to cope with aridity
Low food availability and high energy expenditure are not exclusively found in cold winter climates, but can also occur in hot, dry climates in summer. Desert ecosystems face…
The costs and benefits of hibernation
Some animals hibernate to save energy in times of low energy intake, e.g. due to low food availability. What are the costs and benefits of hibernation? I’ll explain…
What is torpor in mammals?
The maintenance of a high body temperature is a considerable cost for small endothermic animals. Small animals have a relatively large surface to volume ratio resulting in high…
Balancing selection
Balancing selection means that two alleles are maintained in the population because of natural selection. You would expect that one allele will provide higher fitness than the other,…
The evolution of eusociality
If there is a gene that makes you eusocial, making you raise the offspring of other individuals, how does it spread? How can your eusocial gene end up…
Genetic diversity
Genetic diversity is the term for the diversity of the genetic material in a population or species. More different genes inside the population means a higher genetic diversity….
Asexual reproduction
Asexual reproduction is the term for reproduction that only involves one parent individual. The parent produces an offspring without genetic contribution of another individual of its species. As…
Sexual reproduction
Sexual reproduction is the term for reproduction that involves recombining genes of two different individuals to form a new individual. The new individual will have genes / alleles…