The cell wall is a tough and rigid layer that surrounds some types of cells. It is located outside the cell membrane and its main function is to provide rigidity, strength, protection against mechanical stress and infection. It can also provide the cell with limited plasticity that will prevent the cell from rupturing due to turgor pressure.
The options are incomplete and have been listed incorrectly. Complete question has been attached.
Answer:
C) Dd and Dd
Explanation:
It is given that deafness is a recessive trait which means that Dr. Smith has genotype dd since a recessive trait can only be expressed when both the alleles in genotype are recessive. However, his parents are normal. So his parents can have DD or Dd genotype. Dr. Smith has obtained one recessive d allele from his father and other recessive d allele from his mother. Thus, the parents should have Dd genotype and the correct option is c.
Vegetation reproduction <span />
<span>II and III only i think i is right</span>
2. Nucleus
9. Cell Membrane
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