17 Questions
What did Muramatsu demonstrate about the ssp.dicoccum var.liguliforme?
It possesses the Q genotype
What did Muramatsu find about the ssp.carthlicum in his experiments?
It is of QQ genotype
According to Muramatsu's experiments, what happens to the range of variation of characters when Q is present in tetraploid wheats?
It widens significantly
What is the primary purpose of monosomic analysis in wheat?
To identify the location of genes on specific chromosomes
Which statement best describes the genetic complexity in hexaploid wheats with regards to the presence of Q?
Genetic background can influence glume keeledness in hexaploids with Q
Based on Muramatsu's findings, what can be inferred about the phenotypic variation in tetraploid wheats without the Q allele?
It remains narrow
What is the role of the three crossability genes (kr1, kr2, kr3) identified in Chinese Spring wheat?
They facilitate crossing between wheat and rye
What did Muramatsu conclude about the expression of phenotypic variation in different QQ lines of tetraploid wheats?
Variation is very narrow but obvious
Which of the following is a key characteristic of homeologous chromosomes in hexaploid wheat?
They can compensate for the loss of genes on other homeologs
What is a key advantage of using alien tetraploid species in wheat improvement?
Tetraploids can overcome the crossability barriers between wheat and diploid alien species
What is the significance of E.R. Sears' development of a complete set of 21 monosomics in the hexaploid wheat cultivar Chinese Spring?
It provided a valuable tool for locating genes on specific wheat chromosomes
Why has the exploitation of alien germplasm for wheat improvement been limited?
Lack of crossability between wheat and alien species
Which of the following is the most correct description of the evolution of hexaploid wheats?
Hexaploid wheats evolved from the combination of tetraploid wheats and a diploid grass species, Ae. squarrosa.
Which of the following best describes the genome composition of hexaploid wheats?
AABBDD
What is the purpose of the Ph gene located on chromosome 5B in hexaploid wheat?
It prevents homeologous chromosome pairing.
Which of the following best describes the relationship between the chromosomes in a homeologous group in hexaploid wheat?
The chromosomes are closely related but do not pair during meiosis due to the Ph gene.
What is the proposed origin of the tetraploid wheats (AABB genome)?
They evolved from a natural hybridization between T. monococcum (AA) and an unknown species that donated the B genome.
This quiz covers topics related to chromosome loss compensation in homeologous groups, using examples from wheat cultivars. It explores monosomic analysis to locate genes in chromosomes and chromosome arms. The quiz also discusses the viability of monosomics and nullisomics in Triticum aestivum.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
