2. How is a recessive trait represented?
3. What does it mean when a trait is said to have incomplete dominance? Know some common
examples.
4. What does it mean when a trait is co-dominant? Know some common examples.
5. What does it mean when a trait has multiple alleles? Know some common examples.
6. What are some common genetic diseases in humans?
7. What chromosome is the gene for a sex-linked trait located on?
8. If a woman is heterozygous for dimples and her husband does not have dimples, what is the
probability that they will have a child without dimples?
9. If parents have the genotype DdFf and ddff what is the probability that their child will have both
freckles and dimples?
10. Jan has type A blood, she has just had a baby who also has type A blood. If there are two
potential fathers, Ed and Jerry, who have type A and type O blood respectively, which one is the
father?
11. What is the difference between phenotype and genotype?

Recessive traits are represented by lowercase letters; for example, 't' for the recessive trait of tongue rolling. In incomplete dominance, a blend of the two alleles is seen in the phenotype, like red and white flowers producing pink. Co-dominant traits show both alleles fully expressed, such as blood type AB. Multiple alleles refer to genes with more than two alleles, like the ABO blood group system. Genetic diseases in humans include cystic fibrosis, sickle cell anemia, and Huntington's disease. Sex-linked traits are located on the X chromosome. Phenotype is the observable trait, while genotype refers to the genetic makeup of an individual.

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