2007-03-22 07:46:46 · 4 answers · asked by dennis372006 2 in Science & Mathematics ➔ Biology
Hmm, sounds like lots of homework/school stuff here, but you want the homozygous recessive genotype.
2007-03-22 07:50:42 · answer #1 · answered by btpage0630 5 · 1⤊ 0⤋
By definition the testcross is performed using a genotype that is completely homozygous recessive for the genes of interest. This is the only way to reveal recessive alleles in the unknown genotype without doing additional generations after the testcross progeny.
2007-03-22 14:56:46 · answer #2 · answered by Shanna J 4 · 0⤊ 0⤋
unknown genotype is crossed with double recessive homozygous genotype. if the unkwown genotype is homozygous dominant, the progeny will be all dominant phenotypically(not considering incomplete dominance), if the unknown genotype is heterozygous the progeny will show either dominant or recessive trait in a 1:1 ratio and if the unknown genotype is homozygous recessive then the progeny will all show the phenotypically recessive trait.
2007-03-22 14:57:59 · answer #3 · answered by rara avis 4 · 0⤊ 0⤋
An unknown genotype is crossed with homozygous recessive gene.
2007-03-22 14:53:15 · answer #4 · answered by gamma_wave 3 · 1⤊ 1⤋