In humans, identical twins are possible because C. early blastomeres can form a complete embryo if isolated.
Identical twins are formed when an egg after fertilization by a sperm gets divided into two.
The early blastomeres are totipotent cells which means that they have the capability to form all the cells of the body further. Hence, if an egg after fertilization splits into two, it has the potential to form a complete embryo which forms an individual.
However, as the splitting process has occurred after fertilization, hence the two individuals formed will be identical twins. The genome for the identical embryos will be identical.
Identical twins are also referred to as monozygotic twins as they arise from a single egg or zygote.
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C, because that’s what the scientists are saying that’s different, a giraffe with a short neck has a lower Survival while a giraffe with a longer neck has a Higher survival rate.
-In Africa savanna more wildebeest are born than the environment can support. As a result over a period of years individuals that are well suited to the environment reproduce, and those that have lesser adaptations die before they reproduce. This is referred to as natural selection.
Answer:
The correct answer is: Yes, this is an example of Reproductive Isolation.
Explanation:
- Reproductive Isolation can be defined as the mechanism adopted by different species during the course of their evolution, due to which the individuals belonging to different species are incapable of mating with each other and producing viable offspring.
- The given question is an example of Mechanical, Pre-zygotic Reproductive Isolation.
- Prezygotic Isolation refers to the mechanism adopted by individuals of different species during the course of evolution such that successful fertilisation of gametes from individuals of different species never occur, hence a viable zygote is never formed.
- Mechanical Isolation refers to the mechanism adopted by individuals of different species during the course of evolution such that their reproductive organs or the organs that assist in the process of reproduction are incompatible to each other. Hence, the gametes of each species are unable to come in vicinity of each other.
- Here, the pollen grain from the flower of one species of juniper is unable to form the pollen tube when its sits on the stigma of the flower of another species of juniper. This is an example of Mechanical Isolation.