# Monohybrid Cross (Help!)

## Recommended Posts

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 by Nor Antonio
Wrong spelling

##### Share on other sites

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 by StringJunky

## Create an account

Register a new account