In humans, while forelock (W) is dominant over normal hair (w). and brown eyes (
ID: 78519 • Letter: I
Question
In humans, while forelock (W) is dominant over normal hair (w). and brown eyes (B) is dominant over blue eyes(b): a. What is the genotype of individual who is homozygous dominant for both traits?________ b. What is the genotype of an individual who is heterozygous for both traits?________ If two individuals are heterozygous for for both white forelock and brown eyes marry, what percent of their children will have normal hair and blue eyes ? In shorthorn cattle, coat color may be ted (RR). white (R^1R^1) or roan (RR^1). Roan is an intermediate phenotype expressed as a mixture of red and white hairs. The following data were obtained from various crosses: a. red times red rightarrow all null b. white times white rightarrow all whise c. red times white rightarrow all roan d. roan times roan rightarrow 1/4 red 1/2 roan 1/4white Using the phenotype results in the box above, determine the genotypes of each parcel and offspring for each cross? a. Parent______times Parent______Offspring______ b. Parent_______times Parent_______ Offspring_______ c. Parent_______times Parent_______ Offspring_______ d. Parent_______times Parent_______ Offspring_______ What is the pattern of inheritance which determines coal color in the cattle?_______ Contract incomplete dominance and co dominance.Explanation / Answer
Answer:
5).
a). Genotype of homozygous dominant for both traits = WWBB
b). Genotype of heterozygous dominant for both traits = WwBb
6).
WwBb x WwBb
Normal hairs and blue eyes genotype = wwbb
Ww x Ww = WW (1/4), Ww (1/2) & ww (1/4)
Bb x Bb = BB (1/4), Bb (1/2) & bb (1/4)
The probability of normal hairs and blue eyes (wwbb) = 1/4 * 1/4 = 1/16
The percentage of normal hairs and blue eyes (wwbb) = (1/16) 100 = 6.25%
7).
a). Parent: RR x Parent: RR = Offspring: RR
b). Parent: R’R’ x Parent: R’R’ = Offspring: R’R’
c). Parent: RR x Parent: R’R’ = Offspring: RR’
d). Parent: RR’ x Parent: RR’ = Offspring: (1/4) red RR, (1/2) roan RR’ & (1/4) R’R’white
The inheritance pattern is incomplete dominance.
8). Incomplete dominance is an inheritance pattern, in which blending of the dominant & recessive traits so that the third phenotype is something in the middle (red x white = roan).
In co-dominance, the "recessive" & "dominant" traits appear together in the phenotype of hybrid organisms.