Question

A gene contains the information for making proteins in the cell. The proteins synthesized

according to this information may be enzymes that catalyze biochemical reactions. Each trait

is the outcome of several such biochemical reactions, each of which is controlled by a specific

enzyme. If the enzyme is not produced because its gene is absent, that particular reaction will

not occur and trait resulting from its reaction will not appear phenotypically. Thus, each trait

is controlled by a gene.

(i) What is the source of protein formation in a cell?

(ii) Is the biochemical reaction occurring in the cell perfectly accurate? Justify

(iii) What you conclude if a particular trait is not able to express in the progeny?

(iv) What controls the traits that get expressed in the progeny?​

Answer 1

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1. DNA is the basic source of protein making in a cell.

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2. No biochemical reaction is absolutely relieable. This can be proved by this example:

When the process of cell division starts, during reproduction, DNA replication takes place in which a copy of parent's DNA is created to be transferred into the offspring. Since it is a biochemical process and no biochemical process is always exact, some variations occur in the copied DNA. This leads to the formation of a new individual.

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3. Recessive alleles are only expressed when no dominant allele is present. In most sexually reproducing organisms, each individual has two alleles for each gene (one from each parent). This pair of alleles is called a genotype and determines the organism's appearance, or phenotype.

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4. Presence of genes on chromosomes in male and female gametes, together decide which trait will be expressed in the progeny.

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Answer 2

Answer:

I didn't now sister sorry usually