I’m not sure I understand your question.
Answer:
64.
Explanation:
It is 64 because there are 20 amino acids with four bases ( A,T,C and G).
and genetic code can be read in triplets and also the four bases can occupy the positions. Eachh amino acid can be coded by the triplet codons. A triplet codon shows three nucleotides of the mRNA template that can code for amino acid
Therefore the number of codons is 4×4×4= 64.
Nondisjunction results when chromosomes in gametes (egg and sperm cells) do not separate properly during meiosis (cell division of gametes in 2 stages), producing gametes which have more or less than the normal number (23) of chromosomes.
Nondisjunction occurs during anaphase of either Meiosis I or Meiosis II. Anaphase is the splitting and pulling of the chromosomes, lined up at the center of the cell, to the edges or poles of the cell. Shown in the figures below are examples of when nondisjunction occurs in Meiosis I (Anaphse I) and in Meiosis II (Anaphase II).
(Figures source: http://study.com/academy/lesson/nondisjunction-in-meiosis-definition-examples-quiz.html)
The answer is; B
This genotype is similar to that of one parent. It assumes that nondisjunction of chromosome did not happen and there was no fusion of gametes. The offspring cannot have exact genotype as one parent in sexual reproduction, In sexual reproduction, the offspring gets half of its chromosomes from each parent. This is why the chromosome number is reduced by half in the formation of gametes through the process of meiosis.