If a pea plant has a genotype sstt, what are the possible genetic combinations that could be present in a single grain of pollen produced by the plant? (2 points) ss, tt, st st, st, st ss, tt, st, st st, st

ST, St.

Explanation:

As per the question, each cell of the pea plant is diploid and contain genotype SSTt. Thus each microspore mother cell in the anther is also had genotype SSTt.  As a result of meiosis in the microspore mother cell, four haploid microspores or pollen grains are formed in the pea plant. As per Mendel’s law of segregation or purity of gametes, genotypically two types of pollen will form. Half of the pollen will have ST genotype and half of the pollen will have St genotype. Therefore, option D is correct.

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this