You carry out a cross between a true-breeding (homozygous) red-flowered snapdragon and a true-breeding (homozygous) white-flowered snap dragon. The offspring in the F1 generation are all pink. What would the genotype of the offspring (F1) be? a. Homozygous recessiveb. Homozygous dominantc. Heterozygousd. Hemizygous

Question

Biology

Phillip Vega

6 September, 23:17

You carry out a cross between a true-breeding (homozygous) red-flowered snapdragon and a true-breeding (homozygous) white-flowered snap dragon. The offspring in the F1 generation are all pink. What would the genotype of the offspring (F1) be? a. Homozygous recessiveb. Homozygous dominantc. Heterozygousd. Hemizygous

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Gwendolyn Figueroa · Answer 1

Heterozygous

Explanation:

Let's assume that the allele R gives red flowers while the allele "r" gives white flowers. The genotype of the pure breeding plants with red flowers will be "RR" and that of the pure breeding plants with white flowers will be "rr". The "RR" plant will form all the gametes with one copy of "R" allele only. The "rr" plant will produce all the gametes with one copy of "r" allele only. The fusion of gametes with "R" and "r" alleles will form all the progeny with "Rr" genotype. The phenotype of the progeny will be pink. Since "Rr" genotype has one dominant and one recessive allele, it is heterozygous.