Principle Of Inheritance And Variation Question 395
Question: Assertion : Wheat is an example of segmental allopolyploidy. Reason : The three diploid genomes are related.
Options:
A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
Show Answer
Answer:
Correct Answer: A
Solution:
In some allopolyploids, the different genomes which are present are not quite different from one another.
Consequently, in these polyploids chromosomes from different genomes do pair together to some extent and multivalents are formed.
This means that segments of chromosomes and not the whole chromosomes are homologous.
Therefore, such allopolyloids are called segmental allopolyploids.
Our common hexaploid bread wheat is also regarded to be a segmental allopolyploid, because the three diploid genomes are related to each other.
BETA
