Why does a pea pollen grain contain only one flower colour allele?
Pollen cells contain male gametes (sperm). A gamete has only a a single copy of every gene. When the sperm cell fuses with the female egg cell then the new plant which arises will have 2 copies of each gene like it’s parents.
In your example, the male flower colour allele carried in the pollen will be matched with the flower colour allele in the egg and flower colour will then be determined in the new plant according to the alleles inherited from each parent.
Meditation on Flowers & Colour with gentle Irish music
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