What type of Postzygotic barrier is a mule?
The mule is a hybrid between a donkey and a horse or pony. The diploid chromosome number in the donkey is 62 and in the horse or pony it is 64. The mule therefore has 63 chromosomes and is infertile. This is an example of a postzygotic isolating mehanism.
What type of reproductive barrier is a mule?
A Post-zygotic barrier is a reproductive barrier that prevents the zygote from forming, or hampers the developmental process. It does not prevent the animals from mating however. Thus, The sterile mule example falls under the post-zygotic category since the animals were not prevented from mating.
Are mules examples of Postzygotic barriers?
Postzygotic barriers: Postzygotic barriers prevent a hybrid zygote from developing into a viable, fertile adult. The mule is a typical example.
What are the 3 Postzygotic barriers?
Postzygotic barriers include reduced hybrid viability, reduced hybrid fertility, and hybrid breakdown.
Are there any reproductive isolating barriers between the horse and donkey?
Gene flow between horses and donkeys is separated by a post-zygotic barrier called infertile offspring.
Is mule a reproductive isolation?
How is this an example of reproductive isolation? The mule is an example of an infertile hybrid. Even though horses and donkeys can mate and produce healthy offspring, those offspring cannot pass their genetic information down to future generations, so they are a genetic dead-end.
Is a mule postzygotic and Prezygotic?
It may be caused by a mix of several prezygotic and postzygotic factors. Hybrid sterility: This is a type of a postzygotic isolating mechanism. For example, the mule is a hybrid between a donkey and a horse or pony. The diploid chromosome number in the donkey is 62 and in the horse or pony it is 64.
What are two examples of Postzygotic barriers?
Postzygotic barriers include the creation of hybrid individuals that do not survive past the embryonic stages ( hybrid inviability ) or the creation of a hybrid that is sterile and unable to produce offspring ( hybrid sterility ).
Why are mules considered infertile?
They are sterile because they can’t make sperm or eggs. They have trouble making sperm or eggs because their chromosomes don’t match up well. A mule gets 32 horse chromosomes from mom and 31 donkey chromosomes from dad for a total of 63 chromosomes.
What is an example of postzygotic reproductive barrier?
What are two examples of postzygotic barriers?
Are mules sterile?
Befuddling Birth: The Case of the Mule’s Foal Mules — the offspring of female horses and male donkeys — are generally sterile and can’t reproduce. But a female mule in Colbran, Colo., has recently become a mother, and her owners are trying to figure out how it happened.
Which is an example of a postzygotic barrier?
•Postzygotic barriers: Postzygotic barriers prevent a hybrid zygote from developing into a viable, fertile adult. The mule is a typical example. Reduced viability or fertility of hybrid individuals or reduced viability or fertility of the offspring of hybrid individuals are evidence of postzygotic reproductive isolation.
Which is an example of a prezygotic isolating mechanism?
prezygotic mechanism. Habitat isolation, behavioral isolation, temporal isolation, mechanical isolation and gametic isolation are all examples of prezygotic isolating mechanisms. Some species of fruit flies in the genus Rhagoletis provide an example of habitat and behavioral isolating mechanisms.
Which is an example of a reproductive isolating mechanism?
Reproductive isolating mechanisms. • Prezygotic barriers: Anything that prevents mating and fertilization is a prezygotic mechanism. Habitat isolation, behavioral isolation, temporal isolation, mechanical isolation and gametic isolation are all examples of prezygotic isolating mechanisms.