Thank you for reporting, we will resolve it shortly
Q.
Incomplete dominance is shown by
AMUAMU 2002
Solution:
Incomplete dominance (partial or mosaic dominance) given by Correns $1903$ is the phenomenon, where none of the two contrasting alleles or factors is dominant. The expression of the character in a hybrid $\left( F _{1}\right)$ individual is intermediate or a fine mixture of the expression of the two factors. eg, Mirabilis jalapa (four $O'$ clock plant) and Antirrhinum majus (dog flower or snapdragon). There are $2$ types of flower colour in pure state red and white. When the two types of plants are crossed, the hybrid or plants of $F _{1}$ generation have pink flower. If the later are selfed, the plants of $F _{2}$ generation are of three types-red, pink and white in ratio of $1: 2: 1$.
Pisum sativum obeys law of dominance, in which both contrasting alleles (recessive and dominant) are present and able to express dominant one at $F _{1}$ hybrid.
In $F _{1}$ generation, offsprings are tall though they have received both the factors ( $T$ and $t$ ). It is because of the dominant nature of factor for tall and recessive nature of factor for dwarf. On selfing, the recessive trait reappears in the $F_{2}$ generation showing that it is suppressed in $F _{1}$ generation and not lost.
Neurospora crassa was used by Beadle and Tatum for studying mutation. They selected this fungus as it can be readily grown in the laboratory on a defined medium (a medium that contains only known substances, rather than some uncharacterised cell extract). They then exposed its spores to X-ray and allowed the progeny to grow on a complete medium (a medium that contains all necessary nutrients and would, therefore, supplies these nutrients to growing fungi).
