Can you explain to me HOW to do this question (have an exam)?
You have crossed two maize plants that are both heterozygous for a gene controlling kernel colour and for a gene controlling kernel shape. Assuming that allele C (brown kernels) is dominant over c (yellow kernels), and that R (round kernels) is dominant over r (wrinkled kernels), describe the genotypes and phenotypes of the progeny of this cross, and explain what the likely ratio of phenotypes would be.
Punnet square as follows:
KC Kc kC kc
KC KKCC KKCc KkCC KkCc
Kc KKCc KKcc KkCc Kkcc
kC KkCC KkCc kkCC kkCc
kc KkCc Kkcc kkCc kkcc
They’re the genotypes.
The possible phenotypes are Brown and round, brown and wrinkled, yellow and round, yellow and wrinkled.
From the above punnet table, you can work out the ratios since you know what the characteristics each combination of genotypes will have. Work them out as fractions of 16 (ie there are 16 possible genotypes), and then convert to ratios if you wish.
Hope this helps!
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