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Question: Comb shape in chickens represents a classic example of gene interaction. Two gene pairs interact to influence the shape of the comb. The genes for rose com (R) and pea comb (P) together produce walnut comb. The fully homozygous recessive condition (rrpp) produce the single comb. A rose comb chicken is crossed with a walnut comb chicken. and the following offspring are produced: 17 walnut, 16 rose, 7 pea, 6 single.
1) what are the probable genotypes of parents?
2) give the genotypes of each of the pffspring classes
In garden peas, grey seed coat color is dominant to white seed coat color. In the following cross, the phenotypes of the parents and offspring are known, but the genotypes are unknown.
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What factors establish the choice of a paper strip containing bacterial endospores or a sealed ampule containing an endospore suspension for testing heat-sterilization equipment.
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