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HELP PLEASE!! pleaseeee

HELP PLEASE!! pleaseeee-example-1
User Ronke
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7 votes

Answer:

2:1

Step-by-step explanation:

Let the allele for achondroplasia be represented by A.

Since the disease is lethal in AA condition, the two people would rather be Aa.

Aa x Aa

offspring AA Aa Aa aa

The AA offspring does not survive, hence, we are left with 3 children out of which 2 are affected heterozygotes and the remaining 1 is a true-breeding recessive and normal.

The expected ratio of affected to normal offspring is, therefore, 2 to 1.

User Grayson Henry
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