High School

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A snapdragon with pink petals, black anthers, and long stems was allowed to self-fertilize. From the resulting seeds, 650 adult plants were obtained. The phenotypes of these offspring are listed here:

- 78 red long tan
- 26 red short tan
- 44 red long black
- 15 red short black
- 39 pink long tan
- 13 pink short tan
- 204 pink long black
- 68 pink short black
- 5 white long tan
- 2 white short tan
- 117 white long black
- 39 white short black

Using P for one allele and p for the other, indicate how flower color is inherited.

Answer :

Final answer:

Flower color in snapdragons is inherited through incomplete dominance, producing a 1:2:1 phenotypic ratio of red:pink:white among offspring when a heterozygous pink snapdragon self-fertilizes.

Explanation:

The flower color in snapdragons is inherited via incomplete dominance. When a homozygous red-flowered snapdragon (CRCR) is crossed with a homozygous white-flowered snapdragon (CWCW), the offspring will be heterozygous pink-flowered snapdragons (CRCW). The phenotypes of the offspring from a self-fertilizing pink snapdragon (CRCW) will have a genotypic ratio of 1 CRCR:2CRCW:1CWCW, and a phenotypic ratio of 1:red:2:pink:1:white. This is evidence of incomplete dominance as the pink flower phenotype results from the blending of the red (CR) and white (CW) alleles, and there is a clear 1:2:1 ratio among the red, pink, and white offspring from self-fertilization.

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