Question
Question: In Pisum sativum, the dwarfness of plants is a ________ character. A. Dominant B. Recessive C....
In Pisum sativum, the dwarfness of plants is a ________ character.
A. Dominant
B. Recessive
C. Codominant
D. Incomplete dominance
Solution
Hint:- Multicellular plants must be made of more than one cell. Single-celled plants do not exist. Recall that some protists are eukaryotic and photosynthetic, but are not considered plants, such as algae. In addition, plants have specialized reproductive organs.
Complete Answer:- Gregor Mendel tested seven pairs of pea traits in his experiments on plant hybridisation. A "difference in the length of the stem" was one of these features, and Mendel showed the superiority of the tall over the dwarf. White observed that this pair of alleles represented "the existence and absence of a tallness factor" In pea plants, Mendel observed seven distinct characteristics, and each of these features had two types. Height (tall or short), pod shape (inflated or constricted), seed shape (smooth or wrinkled), pea colour (green or yellow), and so on were included in the features. He verified the purity of his plants in the years Mendel spent leaving the plants himself by confirming, for instance, that tall plants had only tall children and grandchildren, and so on.
These parental lines of peas could be called pure-breeders (or, in modern terminology, homozygous for the traits of interest) because the seven pea plant characteristics tracked by Mendel were consistent generation after generation of self-fertilization. Eventually, Mendel and his assistants produced 22 pea plant varieties with variations of these consistent characteristics. In Pisum sativum (garden pea), the height of a plant with genotypes can be high (dominant) or dwarf (recessive)- TT for tall and tt for dwarf, respectively.
Hence, the correct answer id (b) Recessive
Note:- The third theory of inheritance was founded by Mendel: the separate assortment theory. According to this theory, at one locus, alleles segregate into gametes independently of at another locus, alleles. Gametes such as these are produced at equal frequencies.