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Monohybrid Cross Problems, Lecture notes of Genetics

International University Institute of Luxembourg (IUIL)Genetics

Part C: Monohybrid Cross Problems - Show your work with a Punnett Square. 17. Hornless (H) in cattle is dominant over horned (h). A homozygous hornless bull is ...

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Monohybrid Cross Worksheet Name _______________________
Period ______
Part A: Vocabulary
Match the definitions on the left with the terms on the right.
____ 1. genotypes made of the same alleles A. alleles
____ 2. different forms of genes for a single trait B. dominant
____ 3. gene that is always expressed C. heterozygous
____ 4. gene that is expressed only in the homozygous state D. homozygous
____ 5. genotypes made of two different alleles E. recessive
Below each of the following words are choices. Circle the choices that are examples of each of
those words.
6. Dominant allele
D e k L N n R S
7. Recessive allele
M n d F G r k P
8. Homozygous dominant
AA Gg KK mm uu Rr TT
9. Homozygous recessive
ee Ff HH Oo qq Uu ww
10. Genotypes in which the dominant allele is seen (expressed).
AA Dd EE ff Jj RR Ss
11. Genotypes in which the recessive allele is seen (expressed).
aa Gg Ff KK rr Oo Tt
Part B: Punnett Squares
12. Examine the following Punnett squares and circle those that are correct.
D d D D A a A a
d Dd dd d Dd DD A AA aa a Aa aa
d Dd dd d Dd Dd a Aa Aa a Aa aa
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Monohybrid Cross Worksheet Name _______________________

Period ______ Part A: Vocabulary Match the definitions on the left with the terms on the right. ____ 1. genotypes made of the same alleles A. alleles ____ 2. different forms of genes for a single trait B. dominant ____ 3. gene that is always expressed C. heterozygous ____ 4. gene that is expressed only in the homozygous state D. homozygous ____ 5. genotypes made of two different alleles E. recessive Below each of the following words are choices. Circle the choices that are examples of each of those words.

  1. Dominant allele D e k L N n R S
  2. Recessive allele M n d F G r k P
  3. Homozygous dominant AA Gg KK mm uu Rr TT
  4. Homozygous recessive ee Ff HH Oo qq Uu ww
  5. Genotypes in which the dominant allele is seen (expressed). AA Dd EE ff Jj RR Ss
  6. Genotypes in which the recessive allele is seen (expressed). aa Gg Ff KK rr Oo Tt Part B: Punnett Squares
  7. Examine the following Punnett squares and circle those that are correct. D d D D A a A a d Dd dd d Dd DD A AA aa a Aa aa d Dd dd d Dd Dd a Aa Aa a Aa aa
  1. What do the letters on the outside of the Punnett square stand for? ______________________
  2. What do the letters on the inside of the Punnett square stand for? ________________________
  3. In corn plants, normal height, N , is dominant to short height, n. Complete these four Punnett squares showing different crosses. Then, shade red all the homozygous dominant offspring. Shade green all the heterozygous offspring. Leave all the homozygous recessive offspring unshaded. N N N n N n N n n N N n n N n n
  4. In guinea pigs, short hair, S , is dominant to long hair, s. Complete the following Punnett squares according to the directions given. Then, fill in the blanks beside each Punnett square with the correct numbers. a. One guinea pig is Ss and one is ss. Expected number of offspring: ____ Short hair (SS or Ss) ____ Long hair (ss) b. Both guinea pigs are heterozygous for short hair. Expected number of offspring: ____ Short hair ____ Long hair Part C: Monohybrid Cross Problems - Show your work with a Punnett Square.
  5. Hornless (H) in cattle is dominant over horned (h). A homozygous hornless bull is mated with a homozygous horned cow. What will be the genotype and phenotype of the first generation? Parents = _________ x __________ First Generation Genotype (F 1 ) = _________________________ First Generation Phenotype (F 1 ) = _________________________