INET Lab Genetics Worksheet Report
INET Lab Genetics Worksheet Report Template Student: Email: Date: For each correctly conducted genetics problem, you receive 5 points for a maximum 20 points. All Punnett squares must be shown. 1. There are 3 alleles controlling the ABO blood types. IA and IB are codominant genes so that the combination IAIB produces the AB blood type. The third allele, (i) is recessive to the other two alleles. Show your work for each cross. Indicate which of these parents could produce the given child. The first one is provided with answers as an example. (HINT: Do not forget that a heterozygous versus a homozygous blood type may yield different results. ) a) Parent A x AB Child IB B IA IA IA IA IA IB IA IA IA IA IB IA IB IA IA IA IA IB i IA i IB i Produce Child of Type? No Produce Child of Type? © Access Learning Systems 2 b) Parent Child A x O A Produce Child of Type? Produce Child of Type? © Access Learning Systems 3 c) Parent Child A x B O Produce Child of Type? Produce Child of Type? Produce Child of Type? Produce Child of Type? d) Parent Child A x AB O © Access Learning Systems 4 Produce Child of Type? Produce Child of Type? © Access Learning Systems 5 e) Parent Child B x B O Produce Child of Type? Produce Child of Type? Produce Child of Type? f) Parent Child AB x AB A Produce Child of Type? © Access Learning Systems 6 2. The allele for albinism (a) is recessive to the allele for normal pigmentation (A). A normally pigmented woman whose father is an albino marries an albino man whose parents are normal. They have three children, two normal and one albino. Give the genotypes for each person listed. Prove your answer. 8 Maternal Grandmother Father 6 9 Maternal Grandfather Mother Child 1 8 7 Paternal Grandmother 5 6 Paternal Grandfather 7 5 4 1 4 3 Relationship 3 2 # 2 1 Child 2 9 Genotype(s) Child 3 a) Show the cross of the paternal grandparents. (HINT: What must their genotypes be to produce and albino child? ) b) What are the possible genotypes of the maternal grandmother? © Access Learning Systems 7 © Access Learning Systems 8 Show the cross of the mother and father. 3. In horses, black coat color is influenced by the dominant allele (B), and chestnut coat color by the recessive allele (b). a) What color horse would you use to find out the genotype of a black trotter? b) Give the genotype and phenotype. Show your work and discuss the reason you would know the genotype of the black horse. Possible Allele Pairings with Homozygous Dominant Trotter F1 offspring probabilities: Possible Allele Pairings with Heterozygous Trotter F1 offspring probabilities: Reasoning: © Access Learning Systems 9 4. In Drosophila, the fruit fly, white eyes are determined by a recessive XÂlinked gene, and the wildÂtype or normal brick red eyes are due to its dominant allele. Use symbols of the following types: X rY = a whiteÂeyed male; XRXR = a homozygous normal red female. a) What offspring can be expected from a cross of a whiteÂeyed male and a homozygous normal female? b) Show the genotypes and list the phenotypes of the F1 offspring. F1 Cross F1 offspring probabilities: Male Female RedÂEyed WhiteÂEyed c) Now, cross the F1 offspring. Show the genotypes and list the phenotypes of the F 2 offspring. F2 Cross F2 offspring probabilities: Male RedÂEyed WhiteÂEyed Female