A normal appearing couple is found to be heterozygous recessive for albinism. Both have the genotype Aa. The gene responsible fo
r albinism is recessive to the normal pigment-producing gene. What are the chances of their children being albino? 3:4 children will be albino. All children will be albino. 1:4 children will be albino.
Each parent has the Aa genotype and the genotype of a person with albinism is aa. Therefore, to find out what the chances of the children of this pair are albinos, we must do the Square of Punnett and verify how many times the genotype aa appears.
As you can see in the square below, there are 4 possibility of genotypes for the children of this couple. Of these 4, only 1 genotype shows the aa configuration. So the odds of the couple's children being albinos is 1: 4.
1:4 children will be albino. If you make a Punnett square with Aa and Aa, you'll see that the ratios are: AA:Aa:aa=1:2:1 so the ratio of aa out of the total is 1/(1+2+1)=1/4
The nurse should explain to the parent that the sweat test is performed in order to measure the concentration of salt in the child's sweat. Cystic fibrosis is an autosomal recessive disorder which involves the secretion of fluids in specifics exocrine glands.
Another thing would be coal. Corresponding with C. We do not have a limited supply of air, although it will get worse and quality, and the same goes with our soil.