Question

Flower color in snapdragons is due to a gene with incomplete dominance: CRCR plants have red flowers, CRCW have pink flowers, and CWCW plants have white flowers. Which cross is expected to yield progeny that all have pink flowers?CRCR × CRCWCRCR × CWCWCRCW × CRCWCRCW ×CWCWCWCW × CWCW

Answer 1

CRCR × CWCW

Step-by-step explanation:

Flower color in snapdragons exhibits incomplete dominance wherein the heterozygous genotype exhibits the blend phenotype. To have all the pink-flowered progeny, all the progeny should have CRCW genotype and must obtain CR allele from one parent and CW from the other.

Among the given options, parent genotype "CRCR × CWCW" will give all the pink-flowered progeny. The parent plant with genotype CRCR would produce all the gametes with "CR" alleles while the parent with genotype "CWCW" would produce all the gametes with the "CW" allele. The random fusion of these gametes from the two parents would give all pink-flowered progeny with genotype "CRCW".