Answer:
Occurrence and accumulation in time of new mutations in each of the separated populations. This leads to a gradual differentiation.
Explanation:
Allopatric speciation consists of the geographic separation of an original population so that it can give place to two or more new geographically isolated populations. These separations might be due to migration, extinction of geographically intermediate populations, or geological events. In this speciation, some barriers impede genetic interchange, or genetic flux, as the two new populations that are separated can not get together and mate anymore. These barriers might be geographical or ecological.
The process of allopatric speciation involves different steps:
- The emergence of the barrier,
- Interruption in the genetic interchange,
- The occurrence of new mutations and their accumulation in time in each population. Slow and gradual differentiation,
- Genetic divergence by natural selection and reproductive isolation, which makes it impossible for the two groups to cross even if the barrier disappears,
- Prezigotic isolation mechanisms favored by selection once it occurs a secondary contact between the new species in formation.
Answer:
Possible blood type of their children is type A and type B blood
Explanation:
A person can have type A, type B, type AB or type O blood.
A woman who has type AB blood marries a man with type O blood.
Parents AB x OO
Possible genotypes AO BO
Possible blood type of their children is type A and type B blood
Answer: The expected ratio would be 1:2:1.
Explanation: In a dihybrid cross, an organism with two different characteristics crosses with another organism with other two different characteristics. In this question, for example, the doubly heterozygous agouti mouse is represented by AaBb and the doubly homozygous recessive white mouse is aabb. So crossing them, we'll have
ab
AB AaBb (agouti)
Ab Aabb (black fur)
aB aaBb (albino)
ab aabb (albino)
Analising the table, there is 1 in 4 chances of a agouti; 1 in 4 chances of a black fur and 1 in 2 chances of an albino, therefore, the ratio is 1:2:1.
The answer is ATP.
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