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Question
Appearance of walnut-comb in poultry on a cross between pure pea-comb and rose-comb animals is due to
Appearance of walnut-comb in poultry on a cross between pure pea-comb and rose-comb animals is due to
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Solution
The correct option is D Collaborative genes
A collaborative gene is a group of genes that all work together. Typically, these genes are all different types of genes. Pea comb is incompletely dominant over single comb. Heterozygous birds (Pp) will have an intermediate comb, a single comb with three rows of spikes on the top. Birds with smaller single combs crossed with pea comb birds will produce a small blade with the three rows of spikes on top. Much more noticeable on the male.
Rose comb is dominant over single comb. Single comb (p/p r/r) x rose comb (p/p R/R) = rose comb (R/r).
Duplex comb is incompletely dominant to single comb. Heterozygous duplex/single combed birds produce a single comb that is split in the back with a circle of spikes. Much more noticeable on the male.
There are modifiers that can effect the rose, pea and single combs. Thus, the variations in the combs of birds occur. Especially when the birds are walnut combed (P/P R/R).
The walnut comb is produced because P is incompletely dominant to R or R is incompletely dominant to P, either way they both influence each other and walnut comb produced. With some modifiers, cushion comb or a strawberry comb and the other variations of the comb can be occurred.
Thus, the correct answer is option D.
A collaborative gene is a group of genes that all work together. Typically, these genes are all different types of genes. Pea comb is incompletely dominant over single comb. Heterozygous birds (Pp) will have an intermediate comb, a single comb with three rows of spikes on the top. Birds with smaller single combs crossed with pea comb birds will produce a small blade with the three rows of spikes on top. Much more noticeable on the male.
Rose comb is dominant over single comb.
Single comb (p/p r/r) x rose comb (p/p R/R) = rose comb (R/r).
Duplex comb is incompletely dominant to single comb. Heterozygous duplex/single combed birds produce a single comb that is split in the back with a circle of spikes. Much more noticeable on the male.
There are modifiers that can effect the rose, pea and single combs. Thus, the variations in the combs of birds occur. Especially when the birds are walnut combed (P/P R/R).
The walnut comb is produced because P is incompletely dominant to R or R is incompletely dominant to P, either way they both influence each other and walnut comb produced. With some modifiers, cushion comb or a strawberry comb and the other variations of the comb can be occurred.
Duplex comb is incompletely dominant to single comb. Heterozygous duplex/single combed birds produce a single comb that is split in the back with a circle of spikes. Much more noticeable on the male.
There are modifiers that can effect the rose, pea and single combs. Thus, the variations in the combs of birds occur. Especially when the birds are walnut combed (P/P R/R).
The walnut comb is produced because P is incompletely dominant to R or R is incompletely dominant to P, either way they both influence each other and walnut comb produced. With some modifiers, cushion comb or a strawberry comb and the other variations of the comb can be occurred.
Thus, the correct answer is option D.
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