1. In the fruit fly, Drosophila melanogaster, the normal wildtype has long wings and red eyes (both are dominant traits).Recessive forms of these genes result in vestigial wings and browneyes. A red-eyed, vesigial winged male is crossed with abrown-eyed, long winged female.
(a) Assuming each parent is homozygous for the dominant alleles,write out the cross and give the genotype and phenotype of theoffspring.
(b) If each parent is a heterozygote for the dominant alleles,what are the genotypes, phenotypes and ratios of the potentialoffspring?
2. In peas, the allele for tall plant (T) is dominant to theallele for short plants and the allele for purple flowers (P) isdominant to white flowers (p). Write out the results of thefollowing crosses and determine the phenotypic ratios for each:
(a) TtPp x TtPp
(b) Ttpp x ttpp
(c) ttPp x Ttpp
(d) TTpp x ttPP
1. In the fruit fly, Drosophila melanogaster, the normal wildtype has long wings and red eyes (both are dominant traits).Recessive forms of these genes result in vestigial wings and browneyes. A red-eyed, vesigial winged male is crossed with abrown-eyed, long winged female.
(a) Assuming each parent is homozygous for the dominant alleles,write out the cross and give the genotype and phenotype of theoffspring.
(b) If each parent is a heterozygote for the dominant alleles,what are the genotypes, phenotypes and ratios of the potentialoffspring?
2. In peas, the allele for tall plant (T) is dominant to theallele for short plants and the allele for purple flowers (P) isdominant to white flowers (p). Write out the results of thefollowing crosses and determine the phenotypic ratios for each:
(a) TtPp x TtPp
(b) Ttpp x ttpp
(c) ttPp x Ttpp
(d) TTpp x ttPP
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Related questions
Questions 9-15 are related. The drosophila alleles for purpleeyes (instead of red) and dumpy wings (instead of normal) are bothrecessive. Gene âEâ designates eye color (E: dominant, e:recessive), and gene âDâ designates wing shape (D: dominant, d:recessive). You cross a pure breeding purple eyed, normal wingedfly to a true breeding red eyed, dumpy winged fly.
9. What are the genotypes of the parental flies? (select allthat apply)
| EEDD |
| EEDd |
| EEdd |
| EeDD |
| EeDd |
| Eedd |
| eeDD |
| eeDd |
| eedd 10. What would you expect the offspring (F1) phenotypes tobe?
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