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An introduction to genetics concepts, including genotype and phenotype, homozygous and heterozygous genotypes, and the use of punnett squares to predict the genotypic and phenotypic ratios of offspring from a cross between two individuals. Students will learn the definitions of key terms and how to apply this knowledge to complete a punnett square.
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Punnett Square
Now try to complete these crosses…
RR X Rr Rr X rr Rr X Rr
RR X Rr Sex cells formed R, R X R, r Fertilization R r R RR Rr R RR Rr
To complete a Punnett square there are five steps. Here is an example of a question and the right answer.
Q. Two heterozygous green pod plants are crossed with each other. What ratios would you expect in the F1 generation?
Step 3. Give the gametes (sex cells) of the parents.
G , g X G, g
Step 4. Draw the Punnett Square G g G GG Gg g Gg gg
Step 5. Write out the phenotypic and genotypic ratios.
Genotypic ratio: 1GG:2Gg:1gg
Phenotypic Ratio: 3 green pod plants: 1 yellow pod plant