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Question
flobbits are an alien species. the table below provides information about some of their physical traits. use your knowledge of genetics to complete the problems below.
| characteristic | dominant gene | recessive gene |
|---|---|---|
| eye number | one (e) | three (e) |
| lip color | purple (l) | green (l) |
| number of fangs | one (f) | two (f) |
- use the information about flobbits to fill in the phenotypes for each trait.
a. tt ____ b. ll __ c. ee __ d. ee ____
- use the information in the chart to write the genotypes for each trait below.
a. one eye ____ b. two fangs ____
c. short ____ d. purple lips ____
- determine the genotypes using the information in the chart above.
a. heterozygous purple lips ____ b. homozygous one eye ____
c. hybrid one fang ____ d. purebred tall ____
- a tall flobbit named george met and fell in love with a tall flobbit named marge.
a. if marge’s father is a heterozygous tall flobbit and her mother is a short flobbit, what is marge’s genotype? complete the punnett square to show the possible genotypes that would result to help you determine marge’s genotype.
what is marge’s genotype? ______
b. george is heterozygous for this height.
what is his genotype? ______
c. complete the punnett square to show the possibilities that would result if george and marge had offspring.
d. list the possible genotypes and phenotypes for the kids.
______
e. what is the probability of tall flobbit kids? ______%
f. what is the probability of short flobbit kids? ______%
Question 1
Step1: Recall Genotype-Phenotype Rules
For a trait, dominant allele (capital letter) shows phenotype if present. Homozygous dominant (TT) or heterozygous (Tt) shows dominant phenotype; homozygous recessive (tt) shows recessive.
Step2: Analyze Each Option
- A. TT: Both alleles dominant for height. Phenotype: Tall.
- B. ll: Both alleles dominant for lip color (Purple is dominant, L; wait, typo? Wait, table: Lip Color - Dominant Purple (L), Recessive Green (l). So ll? Wait, no, B is "ll"? Wait, table: Lip Color dominant is L (Purple), recessive l (Green). So ll is homozygous recessive? Wait, no, the option B is "ll"? Wait, the problem says "B. ll" – wait, maybe typo, but according to table, Lip Color: Dominant L (Purple), Recessive l (Green). So ll would be Green? Wait, no, wait the problem's part 1: "B. ll" – wait, maybe a typo, but original table: Lip Color - Dominant Purple (L), Recessive Green (l). So if genotype is ll, phenotype is Green? Wait, no, wait the first part: "Use the information about flobbits to fill in the phenotype for each trait." So:
- A. TT: Height trait, T is dominant (Tall). So phenotype: Tall.
- B. ll: Lip Color, l is recessive (Green). Wait, but the dominant is L (Purple), so ll (homozygous recessive) is Green? Wait, but maybe the option is "Ll"? Wait, the user's problem has "B. ll" – maybe typo, but proceed.
- C. ee: Eye Number, e is recessive (Three). So phenotype: Three eyes.
- D. Ee: Eye Number, E is dominant (One). So phenotype: One eye.
Step1: Recall Genotype for Phenotype
- Dominant phenotype (e.g., One eye) can be homozygous dominant (EE) or heterozygous (Ee).
- Recessive phenotype (e.g., Two fangs) is homozygous recessive (ff).
Step2: Analyze Each Option
- A. One eye: Eye Number, dominant E (One). Genotypes: EE or Ee.
- B. Two fangs: Number of Fangs, recessive f (Two). Genotype: ff.
- C. Short: Height, recessive t (Short). Genotype: tt.
- D. Purple lips: Lip Color, dominant L (Purple). Genotypes: LL or Ll.
Step1: Define Terms
- Heterozygous: Different alleles (e.g., Ll).
- Homozygous: Same alleles (EE or ee).
- Hybrid: Heterozygous (same as heterozygous).
- Purebred: Homozygous (e.g., TT or tt).
Step2: Analyze Each Option
- A. Heterozygous purple lips: Lip Color, dominant L (Purple). Heterozygous: Ll.
- B. Homozygous one eye: Eye Number, dominant E (One). Homozygous dominant: EE.
- C. Hybrid one fang: Number of Fangs, dominant F (One). Hybrid (heterozygous): Ff.
- D. Purebred tall: Height, dominant T (Tall). Purebred (homozygous dominant): TT.
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A. Tall
B. Green (if ll is recessive; but check table: Lip Color - Dominant L (Purple), Recessive l (Green). So ll → Green)
C. Three eyes
D. One eye