The right answer is A mutation.
Alteration of the genetic material (DNA or RNA) of a cell or virus that causes a change in certain traits due to the inheritance of this genetic material from generation to generation.
Abnormal modification of the DNA of a gene, either spontaneously during cell division, or under the influence of external agents called mutagens. This gene is modified to be transmitted to the daughter cells. Some mutations have no effect on the cell. Others are the first step in a long process of cancerization.
Rare are the mutations that are beneficial.
Only certain species ofmosquitoes of the Anopheles genus—and only females of those species—can transmitmalaria. Malaria is caused by a one-celled parasite called a Plasmodium. Female Anopheles mosquitoespick up the parasite from infected people when they bite to obtain blood needed to nurture their eggs.
Answer: In eukaryotic species—that is, those whose cells possess a clearly defined nucleus—two important processes occur during speciation: the splitting up of one gene pool into two or more separated gene pools (genetic separation) and the diversification of an array of observable physical characteristics (phenotypic ...
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Answer:
The required pedigree is given in the attachment:
Refer to the key for understanding symbols.
Explanation:
- A record of occurrence of a trait in several generation of a human family is called pedigree analysis.
- It is quite easy to identify some forms of inheritance from study of pedigrees.
- The pedigree analysis is useful in sexually reproducing organism where number of offspring is small.
- It also helps us in giving information about the genotype of an individual; for trait under investigation.
- It also provides information to the would be couples regarding the danger of certain genetic defect which might run in their family.