Question

1. distinguish between genotype and phenotype.
2. what chromosome are sex - linked traits located on?
3. which parent do males get sex - linked traits from?
4. which type of inheritance has an intermediate phenotype?
5. which type of inheritance has two dominant alleles expressed?
6. a child has type o blood. if the mother has type b blood, what possible blood types can the father have?
7. mr. rogers was not capable of telling the difference between tomato and pea soup because he is red - green color blind. color blindness is sex - linked. what is his genotype?

neither of mr. rodger’s parents are color - blind. what are their genotypes? dad ____ mom ____

1. if a female has red - green colorblindness what must her dad’s genotype be?

what about her mom?

Explanation:

1. Genotype is the genetic makeup, phenotype is the observable traits.
2. Sex - linked traits are on sex chromosomes (usually X).
3. Males get sex - linked traits from their mother as they inherit the X chromosome from her.
4. Incomplete dominance has an intermediate phenotype where neither allele is fully dominant.
5. Codominance has two dominant alleles expressed simultaneously.
6. Since the child has type O blood (genotype ii) and the mother has type B (genotype could be IBi or IBIB), the father could have type O (ii), type A (IAi) or type B (IBi) blood to contribute an i allele.
7. For a male with red - green color blindness (sex - linked recessive), his genotype is XbY. Since his father is not color - blind, his father's genotype is XBY. His mother is a carrier with genotype XBXb as she passed the Xb allele to her son.
8. For a female with red - green color blindness (genotype XbXb), her dad must have genotype XbY as he gives his X chromosome to his daughter. Her mom could be a carrier (XBXb) or color - blind (XbXb).

Answer:

1. Genotype is genetic constitution, phenotype is physical expression.
2. Sex chromosomes (usually X).
3. Mother.
4. Incomplete dominance.
5. Codominance.
6. Type O, Type A, Type B.
7. Mr. Rogers: XbY; Dad: XBY; Mom: XBXb
8. Dad: XbY; Mom: XBXb or XbXb