A modified dihybrid mendelian ratio of 9 : 3 : 4 indicates
A modified dihybrid mendelian ratio of 9 : 3 : 4 indicates
The correct option is A Supplementary genes
A.Supplementary
genes – A pair of non allelic genes, one of which produces its effect independently
in the dominant state while the dominant allele of the second gene is without
any independent effect but is able to modify the effect of the former to
produce to a new trait are called Supplemetary genes. Due to these genes in the
F2 generation, 9:3:4 ratio of progeny are obtained. It is a modified
Mendel dihybrid ratio.
B.Complementary
genes – Two genes present on separate loci that interact
together to
produce dominant phenotypic character; neither of them if present alone can
express itself are called complementary genes. Due to these genes in the F2
generation, 9:7 ratio of progeny are obtained. It is a modified Mendel dihybrid
ratio.
C.Lethal
genes – A pair of genes present in the homozygous conditions, causes the death
of the individual are called Lethal genes. Due to the genes, in F2 generation
2:1 ratio of progeny are obtained.
D.Epistatic
genes – A gene which masks the action of another gene is termed as epistatic gene
and process is called epistasis. Due to these genes in the F2 generation,
either 9:3:4 or 12.3.1 ratio of progeny
are obtained. It is a modified Mendel dihybrid ratio.
So,
the correct option is ‘supplementary genes’.
A.Supplementary genes – A pair of non allelic genes, one of which produces its effect independently in the dominant state while the dominant allele of the second gene is without any independent effect but is able to modify the effect of the former to produce to a new trait are called Supplemetary genes. Due to these genes in the F2 generation, 9:3:4 ratio of progeny are obtained. It is a modified Mendel dihybrid ratio.
B.Complementary genes – Two genes present on separate loci that interacttogether to produce dominant phenotypic character; neither of them if present alone can express itself are called complementary genes. Due to these genes in the F2 generation, 9:7 ratio of progeny are obtained. It is a modified Mendel dihybrid ratio.
C.Lethal genes – A pair of genes present in the homozygous conditions, causes the death of the individual are called Lethal genes. Due to the genes, in F2 generation 2:1 ratio of progeny are obtained.
D.Epistatic genes – A gene which masks the action of another gene is termed as epistatic gene and process is called epistasis. Due to these genes in the F2 generation, either 9:3:4 or 12.3.1 ratio of progeny are obtained. It is a modified Mendel dihybrid ratio.
So, the correct option is ‘supplementary genes’.
