Free Printable Post-zygotic barriers

Worksheets

Post-zygotic barriers

Total questions: 10

Worksheet time: 5mins

Name

Class

Date

What is the main difference between a post-zygotic barrier and a pre-zygotic barrier?

all Post-zygotic barriers lead to Allopatric speciation

all Pre-zygotic barriers lead to Sympatric speciation

Fertilization of egg and sperm have occured with post-zygotic barriers

Fertilization of egg and sperm have occured in pre-zygotic barriers

This salamander is an example of reduced viability because it

has poor development of body parts

does not have the same vigor as non hybrids

is Frail or fragile

all are examples of reduced viability

When Animals have reproduced offspring that are not frail and are vigous, yet their chromosomal differences are too great to produce fertile offspring, are an example of this post-zygotic barrier.

Reduced Hybrid Viability

Reduced Hybrid Fertility

Hybrid Breakdown

None of the above

Most of the time this post zygotic barrier is seen in plants and affects the offspring's offspring. In other words, the initial hybrids are perfectly strong but when the offspring try to reproduce that next generation is stunted or sterile.

Reduced hybrid fertility

Reduced hybrid viability

Hybrid breakdown

All of the above