Question: Suppose you have two species of corn. One has sweet kernels and
the other has large ears. Both ha…
Suppose you have two species of corn. One has sweet kernels and
the other has large ears. Both have 20 chromosomes, each of which
is homologous in both species. Suppose you want to create a hybrid
that has both characteristics of sweet kernels and large ears, so
you cross individuals from the two species. Most offspring from
this cross are inviable and have 20 chromosomes, but on occassion
you find a viable tetraploid (4n) individual with 40 chromosomes.
Which of the following could best explain this observation?
A:Nondisjunction of a single chromosome caused the doubling of
the genome.
B: The parents produce diploid gametes on occasion, and when
these fuse they form a viable 4n=40 individual.
|
C: The original F1 hybrid was able to produce normal gametes, D: Nondisjunction of a random set of chromosomes produced E: None of the above can explain the phenomenon. please explain why |
