Natural killer (NK) cells are also called cytotoxic T cells (Option A).
<h3>What are NK cells?</h3>
The NK (Natural killer) cells are cytotoxic lymphocytes that trigger responses from the innate immune system.
Natural killer cells are one of the most important types of lymphocytes (white blood cells) in human cells.
These cells have cytotoxic properties because they produce cytotoxic granules and different cytokines.
Learn more about NK cells here:
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Answer:
c. Aa Bb
Explanation:
The parents were pure breeding with genotypes AAbb and aaBB. A cross between AAbb and aaBB would produce AaBb genotypes in F1 progeny. Two F1 strains would be crossed to produce F2 progeny. The F2 progeny would have the genotype ratio= 1:2:1:2:4:2:1:2:1.
Out of all the obtained genotypes in the F2 generation, the proportion of "AaBb" genotype was 4/16. Therefore, "4" in the given ratio represents the genotype "AaBb".
Enclosed within the nucleolus of the cell.