Genetics And Plant Breeding - Study Mode
[#621] Baldness is
Correct Answer
(B) Sex influenced trait
Explanation
Solution: Baldness is Sex influenced trait. Sex-influenced traits are due to genes on autosomes, and their expression is variable between the sexes. This is different from sex-limited traits, where generally only one sex is affected. An example of this is some forms of baldness, which can affect both males and females, though it's more common in males.
[#622] Seeds of monocotyledons are
Correct Answer
(B) Albuminous and endospermic
Explanation
Solution: Seeds of monocotyledons are Albuminous and endospermic. A seed is an embryonic plant enclosed in a protective outer covering, along with a food reserve. Albuminous seeds refer to those seeds that retain or restore some part of the endosperm during embryonic development. The outer nucellus layer (perisperm) is referred to as albumen, and the inner endosperm layer is vitellus.
[#623] The immediate effect of pollen on the character of endosperm is called
Correct Answer
(B) Xenia
Explanation
Solution: The immediate effect of pollen on the character of endosperm is called Xenia. Xenia in plants is the effect of pollen on the seeds and fruit of the fertilized plant. The effect is separate from the contribution of the pollen toward the next generation. The term was coined in 1881 by the botanist Wilhelm Olbers Focke to refer to effects on maternal tissues, including the seed coat and pericarp, but at that time endosperm was also thought to be a maternal tissue, and the term became closely associated with endosperm effects.
[#624] The transfer of pollen grains from the anthers of a flower to the stigma of the same flower is known as
Correct Answer
(B) Self pollination
Explanation
Solution: The transfer of pollen grains from the anthers of a flower to the stigma of the same flower is known as Self-pollination. Self-pollination limits the variety of progeny and may depress plant vigour. Both hermaphrodite and monoecious species have the potential for self-pollination leading to self-fertilization unless there is a mechanism to avoid it. 80% of all flowering plants are hermaphroditic, meaning they contain both sexes in the same flower.
[#625] Plant breeders' rights are operating in
Correct Answer
(D) All of these
Explanation
Solution: Plant breeders' rights are operating in Germany, Netherlands and Denmark. Plant breeders' rights (PBR), are rights granted to the breeder of a new variety of plant that gives the breeder exclusive control over the propagating material and harvested material of a new variety for several years. The United Kingdom enacted the Plant Variety and Seeds Act of 1964. Similar legislation was passed in the Netherlands, Denmark, Germany and New Zealand.