4
Question
A self-pollinating plant with orange flowers and alternating leaf arrangement produces
Plants with red flowers and alternating leave- 47
Plants with orange flowers and alternating leaves- 103
Plants with yellow flowers and alternating leaves- 51
If a yellow-flowered offspring were self-pollinated, what would the resulting plant's flowers look like?
Plants with red flowers and alternating leave- 47
Plants with orange flowers and alternating leaves- 103
Plants with yellow flowers and alternating leaves- 51
If a yellow-flowered offspring were self-pollinated, what would the resulting plant's flowers look like?
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Solution
The correct option is A 100% yellow
Since the F2 generation of a monohybrid cross is showing the phenotypic ratio of 1:2:1, it is an example of incomplete dominance. Yellow flower (Y) allele is incompletely dominant over that of red flower (y) and the heterozygous dominant genotype (Yy) exhibit orange phenotype. The yellow phenotype is exhibited only by homozygous dominant genotype "YY" while homozygous recessive "yy" exhibits red flower. The genotype of yellow flower plants are YY (homozygous dominant) and self-pollination of yellow flowered offspring would obtain all yellow flower offspring.
Therefore, the correct answer is option A.
Since the F2 generation of a monohybrid cross is showing the phenotypic ratio of 1:2:1, it is an example of incomplete dominance. Yellow flower (Y) allele is incompletely dominant over that of red flower (y) and the heterozygous dominant genotype (Yy) exhibit orange phenotype. The yellow phenotype is exhibited only by homozygous dominant genotype "YY" while homozygous recessive "yy" exhibits red flower. The genotype of yellow flower plants are YY (homozygous dominant) and self-pollination of yellow flowered offspring would obtain all yellow flower offspring.
Therefore, the correct answer is option A.
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