advanced speciation

Question 1

Hybrid breakdown

Answer 1

Post zygotic reproductive barrier that reduces the fitness and fertility of hybrid offspring in subsequent generations due to genetic abnormalities these hybrids harbour

Question 2

Hybrid inviability

Answer 2

Post zygotic reproductive barrier caused by genetic incompatibility between species causing hybrid embryos to be inviable and die before birth, or before reaching reproductive age.

Question 3

Hybrid sterility

Answer 3

Sterility in the offspring of two different species.
Caused due to an odd number of chromosomes within the offspring somatic cells.
Pairing of chromosomes at meiosis to create gametes can’t occur with an odd number.

Question 4

Stratigraphy

Answer 4

The order and relative position of strata and their relationship to the geological timescale. Useful for dating fossils embedded in strata.