Punnett Square Worksheet-Human Characteristics
Punnett Square Worksheet-Human Characteristics
Instructions: Complete the following Punnett Squares and answer the questions. THIS IS HOMEWORK.
1. B= Brown eyes b= blue eyes Mom= Bb Dad= BB What percentage of their children will have Brown eyes and what percentage will have blue eyes?
% of Brown eyes-
% of Blue eyes-
2. Curly hair is recessive (s), and straight hair is dominant (S). A woman with curly hair (ss) marries a man who is a true breeder for straight hair (SS). What percentage of their children will have curly hair, and what percentage of them will have straight hair?
% Curly-
% Straight-
3. A normal chin is a dominant trait (N), while a cleft chin is recessive (n). Two parents both have a normal chin BUT they carry the recessive trait for cleft chin (Nn). What percentage of their kids will be true breeders for a normal chin (NN)? What percentage of their kids will have a normal chin, but still carry the recessive trait for cleft chin (Nn)?
% Normal chin (NN)-
% Normal chin (Nn)-
4. Attached earlobes are dominant (E) over free hanging earlobes (e). Complete the Punnett Square for the following individuals: Mom=Ee and Dad=ee
What percentage of their children will have free hanging earlobes (ee)?
% free hanging earlobes-
5. Freckles are recessive (n). No freckles are dominant (N). Both parents have no freckles, but they both carry the gene for freckles (Nn). What percentage of their children will be true breeders with freckles (nn)? What percentage of their children will be true breeders with NO freckles (NN)? What percentage of their children will have no freckles, but carry the recessive trait for freckles (Nn)?
% NN-
% Nn-
% nn-
6. A structural trait has to do with traits you have that define what you look like. Which of the following is a structural trait that you would inherit from your parents?
a. Having 2 hands and 2 feet
b. Having short hair
c. The ability to speak the same language as your parents
d. The ability to have good fashion sense
7. A puppy would have the MOST structural traits in common with which animal?
a. A fox
b. A bear
c. A dog
d. A rat
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