General
This fertilization occurs when gametes come from the same organism.
What is self-fertilization?
This plant mechanism prevents self-fertilization by rejecting self-pollen.
What is self-incompatibility?
This condition occurs when an organism has both male and female reproductive organs.
What is hermaphroditism?
This term describes the inability to produce viable gametes or offspring
What is sterility?
This fertilization involves gametes from two genetically different individuals.
What is cross-fertilization?
This genetic region controls pollen recognition in SI systems
What is the S-locus?
These animals were given as examples of hermaphrodites in the presentation.
What are earthworms and snails?
One cause of sterility comes from gene mutations or chromosomal abnormalities.
What is genetic sterility?
This genetic effect of cross-fertilization increases variation in a population.
What is increased genetic diversity (heterozygosity)?
If the pollen S-allele matches one in the pistil, this happens.
What is fertilization being blocked or rejected?
This ability allows hermaphrodites to reproduce when mates are scarce.
What is self-fertilization?
Environmental factors such as radiation, toxins, or extreme temperatures may cause this.
What is environmental sterility
Self-fertilization tends to increase this genetic condition within populations.
What is homozygosity?
In this SI system, compatibility depends on the haploid genotype of the pollen
What is gametophytic self-incompatibility?
Even though hermaphrodites can self-fertilize, they usually prefer this to increase genetic diversity.
What is cross-fertilization?
In cross-fertilizing organisms, sterility prevents this key biological process.
What is fertilization?
This evolutionary benefit of cross-fertilization helps populations adapt to environmental changes.
What is increased adaptability/genetic diversity?
In this SI system, compatibility depends on the diploid genotype of the parent plant.
What is sporophytic self-incompatibility?
This drawback of self-fertilization in hermaphrodites can increase the risk of harmful recessive traits.
What is inbreeding depression or reduced genetic diversity?
Hybrid animals like mules are often sterile because chromosomes cannot pair properly during this process
What is meiosis?