alleryStart learning →A snapdragon homozygous for red flowers is crossed with one homozygous for white flowers. What colour are all the offspring?
AAll of them red
BAll of them pink
CAll of them white
DHalf red, half white
Answer & Solution
Correct answer: B. All of them pink
1. Each homozygous parent can donate only one kind of allele, red from one and white from the other.
2. Every offspring therefore carries one red allele and one white allele.
3. In snapdragons the red allele is only incompletely dominant over the white allele.
4. The heterozygote therefore shows an intermediate phenotype, which is pink.
5. A half and half split is impossible, since only one genotype can be produced from two homozygous parents.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 12 "Mendel's Experiments and Heredity", section 12.2 Characteristics and Traits_
Keep practising Mendel's Experiments and Heredity
Browse all Mendel's Experiments and Heredity questions for NCEA Level 2, or explore more Biology topics.
Related questions
Sort each clue by its dominance patternOrder the steps of crossing overKnock out the false allele claimsHow many genes contribute to eye colour in humans, at minimum?A single characteristic gives a phenotypic ratio whose parts total 16. What does that usuaIn shepherd's purse, seeds are ovoid only when both genes are homozygous recessive. What rTwo mice heterozygous at both the A and C genes are crossed. What phenotypic ratio of agouAgouti coat colour needs a dominant A allele, but pigment of any kind needs a dominant C a