Answer;
B) four chromosomes
Explanation;
-Mitosis is a type of cell division that involves nuclear division in eukaryotic cells and occurs when a parent cell divides to produce two identical daughter cells.
-Mitotic cell division produces two daughter cells that are genetically identical to each other, and to the parental cell. Thus, a diploid cell, 2n, (contains two sets of chromosomes), yields two daughter cells that are also diploid.
-For example, in human beings, mitosis takes place in the somatic cells where a parent cell with 46 chromosomes produces two daughter cells each with 46 chromosomes.
Answer:
D. Sterility Locus
Explanation:
Angiosperms have several mechanisms to prevent self-pollination due to the advantage of cross-pollination. One of such mechanisms is self-incompatibility genes present on the sterility locus.
These genes determine the germination of the pollen on the stigma. If both the pollen and stigma carry the same allele of the gene present at the sterility locus, the germination of pollen is prevented.
The sterility locus has multiple alleles and the presence of the same alleles at the same locus in both pollen and stigma prevents the pollen germination.
For example, pollen from S1S2 individuals can not germinate on the stigma with the S1S3 genotype. Here, the pollen does not obtain water as required for germination from the stigma and are unable to germinate.
Lithospheric plates are regions of Earth's crust<span> and upper mantle that are fractured into plates that move across a deeper plasticine mantle.</span>
There relative motions determines the type of boundary the make. convergent<span>, </span>divergent<span>, or </span>transform<span>. </span>Earthquakes<span>, </span>volcanic activity<span>, </span>mountain<span>-building, and </span>oceanic trench <span>formation occur along these </span>plate boundaries.
Answer:
Evolution
Explanation:
Evolution is the change in habits, hereditary and physical characteristics of a species over various generations in response to environmental conditions. Evolution lead to adaptation, the nature selection of the fittest and elimination of remaining.
Evolution may produce variety and diversity in response to mutation, genetic drift and other genetic variation. These changes may pass to offspring and may express them more in one group of population.
Evolution also explain the unity among organisms by explaining their shared characteristics. This refers to their common ancestors.
C. Birds have the same arrangement of bases as flowers
