GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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plants with pink and white roses.
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only plants with pink roses.
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plants with red or white roses in a 3:1 ratio.
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None of the above
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Detailed explanation-1: -Mating a true-breeding pink rose plant with a true-breeding pink rose plant will produce: plants with only pink roses. If an allele is dominant, then: one allele can mask the expression of a recessive allele in a hybrid.
Detailed explanation-2: -When a true-breeding red flower plant is crossed with a true-breeding white flower plant, the resulting generation shows all pink flower plants.
Detailed explanation-3: -A pink flower is a heterozygote and carries one of each allele (red and white). The genotype of this flower can be denoted as RW.
Detailed explanation-4: -How can two pea plants that have different genotypes for seed color be identical in phenotype? A. One of the two plants could be homozygous for the dominant allele, while the other could be homozygous for the recessive allele.
Detailed explanation-5: -Flower color in Rosa is caused by carotenoids, flavonols, and anthocyanidins present in the flower petals (Debener 2003). Pink flower color has been shown to inherit codominantly with white being homozygous recessive, pink being heterozygous, and darker pink being homozygous dominant.