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Watch the video about how to make Punnett Squares and use the ppts attached to the Google Classroom Assignment to practice and see how Punnett Squares are used to determine the probablity of certain alleles (genes) and their expression. After you feel confident about the ppts, complete this practice worksheet.
Don't get overwhelmed by the amount of answers. There is a lot because you have to enter the mother and father alleles in each punnett square as well as the alleles for the offspring and then give the ratios and results for genotype and phenotype.
Questions through 50 are practice. The remaining questions are for probabilities between Wizards and Muggles from the Harry Potter Series.
Try the backcross shown on the ppt slides with Google Classroom assignment. A backcross is used to identify an unknown genotype of an organism expressing a dominant trait. The cross is made with a homozygous recessive pair or alleles. If the unknown genotype is homozygous for the dominant allele then all the offspring will express the dominant allele. However, if the unknown genotype is heterozygous for the dominant allele then 1/2 of the offspring will express the dominant allele and 1/2 will express the recessive allele. Complete the punnett squares to show these results.
From the #11 cross you just completed, is there a chance that she, Mrs. Dursley, could someday have a grandchild or greatgrandchild that had wizarding capabilities
Last Name First Name
Date:
The same alleles as #20.
The same alleles as #20.
The same alleles as #20.
Since everyone in this cross has wizarding capabilities and the allele has to be recessive homozygous for the individual to have these capabilities, all of the answers 50 through 59 have to be the alleles, m m.
Complete the punnett square by putting in the appropriate recessive alleles in all of the locations.
Since everyone in this cross has wizarding capabilities, the alleles have to be recessive homozygous for the individual to have these capabilities, and it is known that they are all pure bloods, all of the answers 64 through 73 have to be the alleles, mm.
Fill in all of the punnett square with the homozygous recessive alleles.
This is the same alleles as Question #83 above.
The alleles for this square are the same as those in Question #85 above.
Since everyone in this cross has wizarding capabilities and the alleles have to be recessive homozygous for the individual to have these capabilities, all of the answers 90 through 99 have to be the alleles, mm.
Type in the correct homozygous recessive alleles for wizarding for the Punnett Square.
Since everyone in this cross has wizarding capabilities and the alleles have to be recessive homozygous for the individual to have these capabilities, all of the answers 118 through 127 have to be the alleles, mm.
Complete the punnett square with the recessive wizarding alleles.
Since everyone in this cross has wizarding capabilities and the alleles have to be recessive homozygous for the individual to have these capabilities, all of the answers 145 through 154 have to be the alleles, mm.
Complete the punnett square with the appropriate recessive wizarding alleles.
Since everyone in this cross is homozygous muggles, all of the answers 203 through 212 have to be the dominant alleles, MM.
Enter the correct dominant alleles to complete the punnett squares.