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The cross between two yellow mice resulted in a phenotypic ratio of _____ in F2 generation. This is caused due to _____ gene that confers yellow color to the mice.
Fill in the blanks using appropriate options:
Option: 1
3:1 ; essential
Option: 2
3:1 ; lethal
Option: 3
2:1 ; essential
Option: 4
2:1 ; lethal
Answers (1)
As we have discussed in Essential Genes & Lethal Genes -
- The cross between two yellow mice resulted in a phenotypic ratio of 2:1 in F2 generation because the individual that was homozygous dominant for yellow allele could not survive. Hence, the allele conferring yellow color is lethal.
- Hence, the correct option is (d).
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