Genetics And Plant Breeding - Study Mode
[#201] Highest uniformity is present in
Correct Answer
(C) Single cross
Explanation
Solution: The highest uniformity is present in a Single cross. The single cross is a first-generation hybrid between two selected and usually inbred lines. The highest uniformity is present in a single cross because a single cross involves a cross hybrid of the first generation between two inbred lines. Single cross hybrids are based on two parental inbred lines whereas three-way crosses first require the production of a single cross hybrid followed by its use as a female parent crossed to a male inbred line.
[#202] Fruit type of sunflower is
Correct Answer
(D) Cypsela
Explanation
Solution: The fruit type of sunflower is Cypsela. Cypsela is a dry single-seeded fruit formed from a double ovary of which only one develops into a seed, as in the daisy family. The term "sunflower seed" is a misnomer when applied to the seed in its pericarp (hull). Botanically speaking, it is a cypsela. When dehulled, the edible remainder is called the sunflower kernel or heart.
[#203] Self-incompatibility was first reported in
Correct Answer
(D) Virbaseum phoeniceum
Explanation
Solution: Self-incompatibility was first reported in Virbaseum phoeniceum. Self-incompatibility is a widespread mechanism in flowering plants that prevents inbreeding and promotes outcrossing. The self-incompatibility response is genetically controlled by one or more multi-allelic loci, and relies on a series of complex cellular interactions between the self-incompatible pollen and pistil. Verbascum phoeniceum is a dicot plant that begins with rosette growth in late spring and into summer. The first observation of self-incompatibility in plants was made on V. phoeniceum in the late 18 th century and published by Joseph Gottlieb Kölreuter.
[#204] CIMMYT is located at
Correct Answer
(A) Mexico
Explanation
Solution: CIMMYT is located in Mexico. CIMMYT is the global leader in publicly-funded maize and wheat research and related farming systems. Headquartered near Mexico City, the Center works with its partners throughout the developing world to sustainably increase the productivity of maize and wheat cropping systems, thus improving global food security and reducing poverty. CIMMYT’s germplasm bank is home to humanity’s largest collection of maize and wheat varieties made freely available to scientists, researchers and farmers around the world.
[#205] The ratio of genotypic covariance to the phenotypic covarience is known as
Correct Answer
(B) Heritability
Explanation
Solution: The ratio of genotypic covariance to the phenotypic covarience is known as Heritability. Heritability is the ratio of genetic variance (VG) to phenotypic variance (VP) and ranges from 0 to 1. High heritability values of 0.5 mean that on average half of the differences among phenotypes of animals are genetic. Low values of approximately 0.1 mean that most of the differences are not genetic.