Question

name: danielbell: 51. eyebrow shape – not connected dominant, connected recessive – use letter a’sa. my trait is connect b. i have the dominant/recessive trait. c. my letters are aad. cross: aa x aagenotypic ratio: 2/4 aa, 2/4 aaphenotypic ratio: 4/4 not connect2. cleft in chin - no cleft dominant, cleft recessive – use c’sa. my trait is no cleft in chin b. i have the dominant/recessive trait. c. my letters are c,cd. cross: cc x ccgenotypic ratio: 2/4 cc, 2/4 ccphenotypic ratio:3. hairline - widow peak dominant, straight hairline recessive – use h’sa. my trait is widow peak b. i have the dominant/recessive trait. c. my letters are h,hd. cross: hh x hhgenotypic ratio: 1/4 hh 1/2 hh 1/4 hhphenotypic ratio: 3/4 widow peak 1/4 straight hairline4. dimples - dimples dominant, no dimples recessive – use d’sa. my trait is no dimples b. i have the dominant/recessive trait. c. my letters are d,dd. cross: dd x ddgenotypic ratio: 1/2 dd 1/2 ddphenotypic ratio: 1/2 dimples 1/2 no dimples5. earlobes - free lobe dominant, attached recessive – use e’sa. my trait is attached b. i have the dominant/recessive trait. c. my letters are e,ed. cross: ee x eegenotypic ratio: 1/2 ee 1/2 eephenotypic ratio: 1/2 attached

Explanation:

Step1: Analyze Cross CC × cc

Offspring genotypes: $Cc, Cc, Cc, Cc$

Step2: Calculate Genotypic Ratio

Count each genotype: $\frac{4}{4} Cc$ (simplifies to $1 Cc$)

Step3: Determine Phenotypic Ratio

$C$ (no cleft) is dominant, so all $Cc$ show no cleft: $\frac{4}{4}$ No cleft

Step4: Correct Error in Cross 1 Genotype

Cross Aa × AA: Offspring are $AA, Aa, AA, Aa$. Genotypic ratio: $\frac{2}{4} AA, \frac{2}{4} Aa$ (or $\frac{1}{2} AA, \frac{1}{2} Aa$)

Step5: Correct Error in Cross 4 Punnett Square

Cross dd × Dd: Parent gametes: $d,d$ and $D,d$. Offspring: $Dd, dd, Dd, dd$

Step6: Correct Cross 5 Phenotypic Ratio

Cross Ee × ee: Offspring $Ee$ (free lobe, dominant) and $ee$ (attached). Ratio: $\frac{1}{2}$ Free lobe, $\frac{1}{2}$ Attached

Answer:

1. Corrected Genotypic Ratio: $\frac{1}{2} AA, \frac{1}{2} Aa$; Phenotypic Ratio remains $\frac{4}{4}$ Not connected
2. Genotypic Ratio: $\frac{4}{4} Cc$; Phenotypic Ratio: $\frac{4}{4}$ No cleft in chin
3. Genotypic and Phenotypic Ratios are correct: Genotypic $\frac{1}{4} HH, \frac{1}{2} Hh, \frac{1}{4} hh$; Phenotypic $\frac{3}{4}$ Widow peak, $\frac{1}{4}$ Straight hairline
4. Corrected Genotypic Ratio: $\frac{1}{2} Dd, \frac{1}{2} dd$; Phenotypic Ratio remains $\frac{1}{2}$ Dimples, $\frac{1}{2}$ No dimples
5. Corrected Phenotypic Ratio: $\frac{1}{2}$ Free lobe, $\frac{1}{2}$ Attached earlobes