If a pair of homologous chromosomes fails to separate during anaphase of meiosis I, what will be the chromosome number of the four resulting gametes with respect to the normal haploid number (n)?
a) n + 1; n + 1; n - 1; n - 1
b) n + 1; n + 1; n; n
c) n + 1; n - 1; n; n
d) n + 1; n - 1; n - 1; n - 1
Answer:
a) n + 1; n + 1; n - 1; n - 1
Explanation:
Separation of homologous chromosomes occurs during anaphase-I of meiosis. This event reduces the chromosome number from 2n to "n" in the daughter cells. If a pair of homologous chromosomes do not separate during anaphase-I, both the homologous chromosomes of that pair would be present in one daughter cell of the meiosis-I (n+1) while the other daughter cell would lack that chromosome (n-1).
Meiosis-II would maintain this chromosome number. Therefore, two gametes will have one extra chromosome (n+1) while the two gametes would lack one chromosome (n-1).
Answer:
365 million years ago
Explanation:
The tetrapods are a super-family which includes all living and extinct vertebrates that have walked and are still walking the Earth, including the mammals, reptilians, dinosaurs, sinapsids, pterodactyls, amphibians, birds. They have evolved from fish-like creatures that were living in the shallows, and over the course of millions of years they were slowly changing and adapting to amphibian life, thus partially aquatic, partially terrestrial. The first proper limbs, at least what is know so far from the fossil records, have emerged with the ichthyostega and acoantostega around 365 million years ago. These two species were able to lift their body above the ground with their limbs, support its weight, and walk on them without dragging their body on the ground. The first transitional limbs can be seen in a species that has been dated to around 375 million years ago, the Tiktaalik, which had had limbs, but still not well developed, and it was only able to stand on them while in shallow water, but on on land.
Answer:
FALSE
Explanation:
Dementia can be described as a collective term for a number of diseases in which a person loses his/her memory, is unable to perform everyday tasks etc. Problems with short term memory are the first of symptoms to be seen in the case of dementia.
In the above scenario, Ronald has signed the contract when he was in a healthy period. So, the contract would be legal and enforced because a healthy person had signed it.
Feral hogs is the right answer
