In a certain plant, when individuals with blue flowers are crossed with individuals with blue flowers, only blue flowers are produced. Plants with red flowers crossed with plants with red flowers sometimes produce only red flowers, while other times they produce either red or blue flowers. When plants with red flowers are crossed with plants with blue flowers, sometimes only red flowers are produced; other times either red or blue flowers are produced. Which gene is dominant?
2.Which is easier to establish in a pure-breeding population, a dominant or a recessive gene?
3.Tall (D) is dominant to dwarf (d). Give the F2 genotypic and phenotypic ratios of a cross between a pure-breeding, tall plant and a pure-breeding, dwarf plant.
4.If wire hair (W) is dominant to smooth hair (w) and you find a wire-haired puppy, how would you determine its genotype by a genetic breeding experiment? Give both the genotype and phenotype involved with the cross with the unknown.
5.In poultry, rose comb is controlled by a dominant allele and its recessive allele controls single comb.
(a)Give the genotype and phenotype produced from crossing a pure-breeding, rose comb chicken with a pure-breeding, single comb chicken.
(b)Give the results of the backcross of the F1 hybrid with both pure-breeding parents.
6.If black fur color is controlled by a dominant allele (B) and brown by its recessive allele (b), give the genotypes of the parents and offspring of a cross of a black male with a brown female that produces 1/2 black offspring and 1/2 brown offspring.
7.If 2 spot (S) is dominant to 4 spot (s), give the genotypes for the parents in the following crosses:
(a)2 spot ? 2 spot yields 2 spot and 4 spot
(b)2 spot ? 4 spot yields only 2 spot
(c)2 spot ? 4 spot yields 2 spot and 4 spot
(d)2 spot ? 2 spot yields only 2 spot
(e)4 spot ? 4 spot yields only 4 spot
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