Question

A Red Snapdragon flower is crossed with a white Snapdragon flower, and all the resulting flowers from the cross are pink. Which type of inheritance is occurring here?
A) Incomplete dominance
B) Codominance
C) Sex-linked inheritance
D) Pleiotropy
E) Polygenic inheritance

Answer 1

Antirrhinum if a plant genus commonly known as Dragon flowers or Snapdragon because of a flower resemblance to the Dragon face that opens and closes its mouth when it is squeezed. They are native to the regions of Europe, the United States and North Africa.

Complete answer:
Several species of Antirrhinum are self-incompatible which means that a plant cannot be fertilized by its pollen. Self-incompatibility in the gene has been studied since the early 1900s.

Option A: Incomplete dominance: Incomplete dominance is the point at which a prevailing allele, or type of quality, doesn't cover the impacts of a passive allele, and the life form's subsequent actual appearance shows a mixing of the two alleles. It is additionally called semi- dominance or incomplete dominance. The example of this case is the red snapdragon flower. If homozygous red snapdragons (RR) are crossed with homozygous white snapdragons (WW), the F1 age will have every single pink blossom (RW). If two of these half breed pink snapdragons are crossed, the subsequent F2 age is anticipated to create 25% red blossoms (homozygous-RR), half pink blossoms (heterozygous-RW), and 25% white blossoms (homozygous-WW).

When F1 hybrids exhibit a variety of the blending of characters of two parents it is called inadequate dominance. For example, in Snapdragon, one parent is homozygous for red flowers (AA) And the other is homozygous for white flowers (aa). No dominance is present and the heterozygous F1 flowers are pink. The 1:2:1 ratio of red, pink and white flowers in the F2 progeny are shown by appropriate colouring. Incomplete dominance or "mixing legacy" happens when every one of two differentiating alleles is communicated somewhat in a half and a half and the aggregate is a middle of the road between the other options. The first aggregates return when new homozygous people are made.

Option B:Codominance: in codominance, both alleles of a pair express themselves fully in the F1 hybrid. For example, in cattle’s when a cow with the red coat is crossed with a cow having the white coat, the F1 hybrid possesses roan appearance. In roan appearance, the Red and White hairs occur in patches but no hairs have intermediate colours of red and white.
Option C: Sex-linked inheritance: sex chromosomes are primarily concerned with the determination of sex, but these do carry the genes also for other characters. Such characters whose genes are located on the sex chromosomes are known as sex-linked characters. For example, colour blindness in humans.
Option D: pleiotropy: pleiotropy is the condition in which one gene produces many effects. In other words, a pleiotropic gene produces a major phenotypic trait and also, it influences some other phenotypic traits.

Option E: Polygenic inheritance: polygenic inheritance is the condition when many genes control the inheritance of one trait or character. Genes are called polygenes and show quantitative inheritance. For example, kernel colour of wheat and skin colour in humans.

Thus, the answer is option ‘A’ i.e, ‘incomplete dominance’

Note: In extension to growing plants for Cut flowers, seeds have been utilized to remove edible oil primarily in Russia, while leaves and flowers have been evaluated to possess anti-inflammatory properties and have been used in poultices. The green colour was also extracted from the flowers.