Answer:
The correct answer is "each of the MHC genes has a large number of alleles, but each individual only inherits two for each gene".
Explanation:
In normal conditions, an individual has only two different alleles for a given gene: one inherited from his mother and the other from his father. However, this does not mean that among humans, there are only two different alleles for each gene. The major histocompatibility (MHC) genes are a clear example of this, since there are multiple combinations for each MHC class. For instance, there are 40 very similar alleles only for the HLA-B27 subtype.
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.
D. presence or absence of a surrounding membraneAS, Nucleus is a membrane bound organelle whereas Nucleolus <span>has no limiting membrane.</span>