Here are the answers to your worksheet, broken down by section.
1. Heterozygous (He) or Homozygous (Ho)
*Rule: If the two letters are different (one big, one small), it is
Heterozygous. If the two letters are exactly the same, it is
Homozygous.*
*
AA: Ho (Same letters)
*
Bb: He (Different letters)
*
Cc: He (Different letters)
*
DD: Ho (Same letters)
*
Ee: He (Different letters)
*
ff: Ho (Same letters)
*
Gg: He (Different letters)
*
HH: Ho (Same letters)
*
ii: Ho (Same letters)
*
Jj: He (Different letters)
*
kk: Ho (Same letters)
*
LL: Ho (Same letters)
*
Mm: He (Different letters)
*
nn: Ho (Same letters)
*
oo: Ho (Same letters)
*
pp: Ho (Same letters)
---
2. Determine Phenotypes
*Rule: The dominant trait (capital letter) wins. You only see the recessive trait (small letter) if there are NO capital letters present.*
(Purple flowers are dominant to white flowers)
*
PP: Purple
*
Pp: Purple (Capital P dominates)
*
pp: White
(Brown eyes are dominant to blue eyes)
*
BB: Brown
*
Bb: Brown (Capital B dominates)
*
bb: Blue
(Bobtails in cats are recessive)
*(This means "Normal tail" is dominant and "Bobtail" is recessive)*
*
TT: Normal tail
*
Tt: Normal tail (Capital T dominates)
*
tt: Bobtail
(Round seeds are dominant to wrinkled seeds)
*
RR: Round
*
Rr: Round (Capital R dominates)
*
rr: Wrinkled
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3. List Genotypes
*Rule: Use the first letter of the dominant trait. Dominant traits can be two capitals or one of each. Recessive traits must be two small letters.*
Straight hair is dominant to curly. (Let's use
S)
*
Straight: SS or Ss
*
Curly: ss
Pointed heads are dominant to round heads. (Let's use
P)
*
Pointed: PP or Pp
*
Round: pp
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Final Answer:
1. He or Ho:
AA: Ho | Bb: He | Cc: He | DD: Ho | Ee: He | ff: Ho | Gg: He | HH: Ho
ii: Ho | Jj: He | kk: Ho | LL: Ho | Mm: He | nn: Ho | oo: Ho | pp: Ho
2. Phenotypes:
* PP: Purple | Pp: Purple | pp: White
* BB: Brown | Bb: Brown | bb: Blue
* TT: Normal Tail | Tt: Normal Tail | tt: Bobtail
* RR: Round | Rr: Round | rr: Wrinkled
3. Genotypes:
* Straight: SS, Ss
* Curly: ss
* Pointed: PP, Pp
* Round: pp
Parent Tip: Review the logic above to help your child master the concept of genotype phenotype worksheet.
