Inheritance of dominant-recessive traits Simple Genetics Worksheet Part 1: Please show your work. ***Inheritance of dominant-recessive traits. Use B for brown hair and b for blonde hair. Assume that...

Inheritance of dominant-recessive traits
Simple Genetics Worksheet Part 1: Please show your work.
***Inheritance of dominant-recessive traits. Use B for
own hair and b for blonde hair. Assume that hair color is a single-gene trait for the purposes of this activity. Brown hair will be dominant in the phenotype: therefore Brown haired people will have a genotype with at least one (B). Blonde hair will be recessive, and only occur if an individual has two copies of the recessive allele.
1. Mom has blonde hair (a recessive trait) and Dad has
own hair (dominant). If Dad is homozygous for the trait, what are the possibilities for the children?
a. genotype
 There is a ____% chance each child will be homozygous dominant
 There is a ____% chance each child will be homozygous recessive.
 There is a ____% chance each child will be heterozygous.
. phenotype
Each child has a ____% chance of having
own hair, and a ____% chance of having blonde hair. 
2. Mom has blond hair and Dad is heterozygous for
own hair. What are the possibilities for their children?
a. genotype
____% homozygous dominant.
____% chance homozygous recessive.
____% chance heterozygous.
. phenotype
Each child has a ____% chance of having
own hair and a ____% chance of having blonde hair.
***Inheritance of blood type (A and B alleles are co-dominant, O is recessive- determine the genotypes from the phenotypes). Human blood types are A (including at least one dominant A allele), B (including at least one dominant B allele), AB (including both dominant alleles A and B), or O (with two recessive O alleles). To avoid confusion, do not use lowercase letters on these squares. Just remember that O is the only recessive, and that recessive alleles may appear in the genotype, but disappear in the phenotype if there is a dominant allele present. Each individuals will only have 2 alleles for their blood type.
3. Mom has type O blood and Dad is heterozygous for type A. What are the possible blood types for their children?  
Each child has a ____% chance of having type O and a ____% chance of having type A
4. Both Mom and Dad have type AB blood. What are the possibilities of phenotypes for their children?
Each child has a ____% chance of having type A blood, a ____% chance of having type B, a ____% chance of having type AB, and a ____% chance of type O.
5. A man has been taken to court in a paternity suit by a woman who claims he is the father of her son. The man claims innocence. At the trial, the expert witness reveals the blood types of all three as follows: Mom= type A, Man= type B, Son= type O. Could this man be the father of the child? Explain your answer.
 
6. If a child and his mother have attached earlobes and the father has free-hanging earlobes, can you determine the genotype of the father for that trait?  If so, what is it? (Use F for free-hanging, and f for attached earlobes. Free hanging is dominant.