Monohybrid Cross (Help!)

[Nor Antonio]

Hi, can you help me solve this monohybrid cross? (Most especially on letter B). Thank you.

 

1.    In humans, achondroplasia “dwarfism” is dominant over normal. A homozygous dominant person dies before the age of one. A heterozygous person is dwarfed. A homozygous recessive individual is normal. A heterozygous dwarf man marries a dwarf heterozygous woman. 
a. What is the probability (in percent) of a having a normal child? 
b. What is the probability (in percent) that the next child will also be normal? 
c. What is the probability (in percent) of having a child that is a dwarf? 
d. What is the probability (in percent) of having a child that dies at one from this disorder?

Edited February 16, 2018 by Nor Antonio
Wrong spelling

[StringJunky]

Look at the possible combinations N = Normal height and A -Achondroplastic :

Man A and N     Woman A and N 

         A                x               A                   = Achondroplastic and won't survive

         A                x                N                 = Achondroplastic

         N              x                 A                   =Achondroplastic

         N                x               N                   = Normal

Express the frequency of each type as a % .of the total crosses.

        

 

Edited February 16, 2018 by StringJunky