The color blindness gene is recessive and X linked. It is written as Xb. A woman who is color blind has a son with a man with normal vision. What is the genotype of the son? Use a Punnett square to answer the question.

Genotype of the son = XᵇY.

Explanation:

The trait is X linked recessive that means in female if both the alleles are Xᵇ then only female will show traits of color blindness whereas in males since they only have one X chromosome even if one Xᵇ will be present, he will show color blindness traits. But in the given example, woman is color blind while man has normal vision. It simply means that genotype of woman is XᵇXᵇ while that of man is XY.

The Punnett square diagram depicting the cross is attached as under:

It may be noted that their son will be born with a genotype XᵇY so as already explained he will be color blind.

Proteins are the workhorses of the cell, controlling virtually every reaction within as well as providing structure and serving as signals to other cells. proteins are long chains of  amino acids  , and the exact sequence of the amino acids determines the final structure and function of the protein. instructions for that sequence are encoded in  genes  . to make a particular protein, a messenger ribonucleic acid (mrna) copy is made from the gene (in the process called  transcription  ), and the mrna is transported to the  ribosome  . protein synthesis, also called  translation  , begins when the two ribosomal subunits link onto the mrna. this step, called initiation, is followed by elongation, in which successive amino acids are added to the growing chain, brought in by transfer rnas (trnas). in this step, the ribosome reads the  nucleotides  of mrna three by three, in units called  codons  , and matches each to three nucleotides on the trna, called the anticodon. finally, during termination, the ribosome unbinds from the mrna, and the  amino acid  chain goes on to be processed and folded to make the final, functional protein