If the cell is prokaryotic, there will be no nucleus present; prokaryotic cells have a cell wall, flagella, and pilus. Eukaryotic cells have a nucleus, no cell wall, and contain more organelles than prokaryotes; they are more complex.
The best evidence that shows that the trait in the pedigree chart is a recessive trait is couple 3-4 in the 2nd generation producing children who do not show the trait.
The father (3) is affected for the trait but the mother is not. However, none of the children is affected. This means that the allele inherited from the mother by the children is able to mask the effects of the affected allele they inherited from their father.
If the allele they inherited from their father is not recessive, definitely the children should have been affected by the trait. Hence, the trait is expressed by homzygous recessive alleles.
Social behavior refers to the interaction exhibited among two or more organisms of the same specie. Benefits of social behaviour include the following: 1. It offers protection. Many animals live together in groups in order to secure protection for themselves. 2. It heightened the success of obtain food. Previous studies have shown that many animals are successful in searching for food if they search in groups. 3. Some animals travel in groups in order to make travel easier and also to protect themselves from predators.