MONOHYBRID AND DIHYBRID CROSSES

Worksheet by Sukhaynah Said
MONOHYBRID AND DIHYBRID CROSSES worksheet preview image
Subjects
Science
Grades
9
Language
ENG
Assignments
40 classrooms used this worksheet

1. A square diagram used to predict the genotypes of a particular cross is known as _. Punet square Punnet square Punnett square Pannett square 2. Direct crossing of alleles works well with monohybrid crosses because _. the offspring obtainable from these crosses are all homozygous the offspring obtainable fromthese crosses are all heterozygous monohybrid crosses involve only one character the phenotypic and genotypic ratios involve small numbers 3. In many Filipinos, black eyes are dominant over brown eyes. What type of offspring would you expect if you crossed a heterozygous black eyed person with a heterozygous brown eyed person? Let B - black and b- brown BB, Bb, Bb, Bb BB, BB, Bb, bb BB, Bb, Bb, bb BB, Bb, bb, bb 4. Crosses involving two charcaters at a time are called _. monohybrid crosses dihybrid corsses multiple crosses 2x2 cross test 5. How many offspring are there in the F2 generation of a dihybrid cross? 4 8 12 16 6. How many offspring in the F2 generation will express two dominant characters? 3 6 9 12 7. How many offspring in the F2 generation will express one dominant and one recessive character? 1 3 6 9 8. How many offspring will express both recessive characters? 1 3 6 9 9. Set up a punnett square using the following information:  Dominant allele for normal coat color in wolves =N  Dominant allele for brown eyes = B  Recessive allele for black coat color in wolves =n  Recessive allele for blue eyes = b  Cross a heterozygous parent with a heterozygous parent. NNBB NNBb NnBB NnBb NNBb NNbb NnBb Nnbb NnBB NnBb nnBB nnBb NnBb Nnbb nnBb nnbb 10. How many wolves of the dihybrid cross in question 9 would have normal coat with brown eyes? 6 8 9 12 11. How many offspring in the dihybrid cross in question 9 would be normal coat with blue eyes? 3 6 9 12 12. How many wolves would be with black coat and blue eyes? 9 6 3 1 13. What is the genotypic ratio: 9:3:3:1 9:6:1 1:3:3:9 1:6:9 14. How many wolves will be homozygous dominant? 9 6 3 1 15. How many wolves will be homozygous recessive? 9 6 3 1

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