1. In people, pointed eyebrowns (B) are dominant over smooth eyebrowns (b). Mary
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Question
1. In people, pointed eyebrowns (B) are dominant over smooth eyebrowns (b). Mary's father has pointed eyebrows, but she and her mother have smooth ones. What is the genotype of her father?
2. Round peas (P) are dominant over wrinkled peas (p). In a cross of a homozygous dominant and homozygous recessive plant.
a. What are th genotypes and phenotypes of the offspring?
b. make a cross using a punnet square between two of the offspring plants. what are the geneotypes and phenotypes resulting from this cross?
c. what are the genotypic and phenotypic ratios of this cross?
3. Half of the children in a family have a detached earlobe, which is a dominant (D) trait. what are the genotypes of the parents?
Explanation / Answer
1. Mary's father is heterozygous for pointed eye brows and Mary's mother is homozygous for smooth eyebrows. Hence, Mary has smooth eyebrows. the genotype of her father is Bb.
2. a. Cross between homozygous dominant (PP) and homozygous wrinkled (pp) results in Pp and Pp genotypes and 1:1 heterozygous offspring.
b. The punnet square is given below.
c. Tge genotypic and phenotypic ratio is 1:1.
3. The detached ear lobe (D) is dominant and the genotypes of parents is DD and Dd.
Pp
male/female P P p Pp Pp p PpPp
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