1. A plant with red flowers is crossed with a white-flowered plant of the same s
ID: 12851 • Letter: 1
Question
1. A plant with red flowers is crossed with a white-flowered plant of the same species. All the seeds, when grown, produce plants with red flowers. Assuming that the flower color is controlled by a single pair of alleles, which allele is dominant and which is recessive?2. In cats, the allele (S) for short fur is dominant to the allele (s) for long fur.
What is the genotype of a true-breeding, long-furred cat?
3. In cats, the allele (S) for short fur is dominant to the allele (s) for long fur.
What is the phenotype of a cat with the genotype Ss?
4. In cats, the allele (S) for short fur is dominant to the allele (s) for long fur.
In an Ss genotype, which allele is expressed in the phenotype?
5. In cats, the allele (S) for short fur is dominant to the allele (s) for long fur.
Which of the fo1lowing genotypes is (i) heterozygous (ii) homozygous dominant?
SS, Ss, ss
Explanation / Answer
1. A plant with red flowers is crossed with a white-flowered plant of the same species. All the seeds, when grown, produce plants with red flowers. Assuming that the flower color is controlled by a single pair of alleles, which allele is dominant and which is recessive?
red flowers RR X rr white-flowered
gametes R r
red flowersRr
so R red allele dominant
white r allele recessive
2. In cats, the allele (S) for short fur is dominant to the allele (s) for long fur.
What is the genotype of a true-breeding, long-furred cat?
genotype-------- ss
3. In cats, the allele (S) for short fur is dominant to the allele (s) for long fur.
What is the phenotype of a cat with the genotype Ss?
short fur
4. In cats, the allele (S) for short fur is dominant to the allele (s) for long fur.
In an Ss genotype, which allele is expressed in the phenotype?
allele (S) for short fur is dominant
5. In cats, the allele (S) for short fur is dominant to the allele (s) for long fur.
Which of the fo1lowing genotypes is (i) heterozygous (ii) homozygous dominant?
SS, Ss, ss
(i) heterozygous
Ss
(ii) homozygous dominant?
SS,
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