Which of the following is correct for starch synthesis in pea?

In case of starch synthesis in pea seeds [controlled by B gene], BB homozygotes produce large and round starch grains; bb homozygotes produce smaller and wrinkled starch grains and Heterozygotes produce round seeds of intermediate size.

Is starch synthesis in pea multiple Allelism?

Starch synthesis in pea is not controlled by Multiple alleles. Starch synthesis in pea plants (Pisum sativum) is associated with another interesting phenomenon of pleiotropy.

What is starch grain in pea plant?

The starch synthesis in pea plants is controlled by a single gene. BB homozygotes produce starch effectively and therefore produce large starch grains. Whereas the bb homozygotes are less efficient in starch production and hence produce smaller grains.

Is starch grain size incomplete dominance?

The starch synthesis in pea plants is controlled by a single gene. It has two alleles B and b. Deviation from Mendel’s law of dominance: If starch grain size is considered as the phenotype, then one can see that the alleles show incomplete dominance.

How starch is synthesized?

Starch is synthesized via four committed enzyme steps: ADP-Glc pyrophosphorylase, which synthesizes sugar nucleotide precursors; starch synthase, which extends the alpha-1,4-linked glucan chains using ADP-Glc; starch-branching enzymes, which introduce alpha-1,6 branch points to form amylopectin; and starch debranching …

Which of the following pairs is wrongly matched starch synthesis in pea?

‘Starch synthesis in pea: Multiple alleles’ is the wrongly matched pair among the given pairs. In pea plants, the synthesis of starch is controlled by a single gene with 2 alleles which are B and b.

What is an example of pleiotropy?

One of the most widely cited examples of pleiotropy in humans is phenylketonuria (PKU). This disorder is caused by a deficiency of the enzyme phenylalanine hydroxylase, which is necessary to convert the essential amino acid phenylalanine to tyrosine.

What is starch grain?

Starch grains are tiny structures made by most plants as products of photosynthesis. Essentially, a starch grain is a well-packed storehouse of glucose sugar units. Many plants store starch grains in underground organs such as roots, bulbs, tubers, and rhizomes, as well as their seeds and stems.

How would you explain incomplete dominance using the example of starch synthesis in pea seeds?

Heterozygotes produce round seeds, and so B seems to be the dominant allele. But, the starch grains produced are of intermediate size in Bb seeds. So if starch grain size is considered as the phenotype, then from this angle, the alleles show incomplete dominance.

When a pea plant with intermediate sized starch grain in seed is crossed with other plant?

When plant with intermediate sized starch grains is crossed to a plant with small sized starch grains, the resulting offspring show round shaped seeds with intermediate sized starch grains and wrinkled shaped seeds with small sized starch grains. But no offspring shows round shaped seeds with large starch grains.

How do plants manufacture starch?

Plants produce starch by first converting glucose 1-phosphate to ADP-glucose using the enzyme glucose-1-phosphate adenylyltransferase. This step requires energy in the form of ATP.

Where is starch synthesized in a plant?

leaves
Starch is synthesized in the plastids—chloroplasts in leaves or specialized amyloplasts in the starch-storing tissues of staple crops.