The back cross can distinguish heterozygotes from homozygotes as they give _________ phenotypic ratio respectively.(a) 1:1 dominant: recessive ; all recessive(b) All dominant; all dominant(c) 1:1 recessive; dominant; all dominant(d) All dominant; 1:1 recessive: dominantI had been asked this question in an interview.The origin of the question is Monohybrid Cross in portion Mendelian Genetics of Cytogenetics

The back cross can distinguish heterozygotes from homozygotes as they

1.	The back cross can distinguish heterozygotes from homozygotes as they give _________ phenotypic ratio respectively.(a) 1:1 dominant: recessive ; all recessive(b) All dominant; all dominant(c) 1:1 recessive; dominant; all dominant(d) All dominant; 1:1 recessive: dominantI had been asked this question in an interview.The origin of the question is Monohybrid Cross in portion Mendelian Genetics of Cytogenetics
Answer» Correct OPTION is (c) 1:1 RECESSIVE; dominant; all dominant The explanation is: Test cross with a double recessive parent and a homozygous dominant will GIVE all heterozygotes, which will express dominant TRAIT. On the other hand heterozygotes will give 1:1 heterozygote: homozygote which will express dominant: recessive.

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