Explanation

The nucleolus is the site within the nucleus where ribosomal RNA (rRNA) is synthesized and combined with proteins to form ribosome subunits.

Explanation

Phenotype refers to an individual's observable traits, such as height, eye color and blood type

A person's phenotype is determined by both their genomic makeup (genotype) and environmental factors.

Explanation

Potassium ions play a crucial role in the conduction of nerve impulses.

They help in the repolarization phase of the action potential,

Allowing the nerve cell to reset its membrane potential after the transmission of an impulse

Explanation

Divergent evolution occurs when two or more species evolve from a common ancestor and adapt to different ecological niches, leading to increased differences between them over time.

Explanation

Pteridophytes, such as ferns, are vascular plants that reproduce via spores rather than seeds.

They have a well-developed vascular system for transporting water and nutrients, distinguishing them from non-vascular bryophytes.

Explanation

The mass extinction event that led to the demise of dinosaurs occurred at the end of the Cretaceous period, approximately 66 million years ago.

Explanation

In the Linnaean system of classification, the order is a rank below class and above family.

It groups organisms that share common characteristics.

Explanation

The law of independent assortment states that genes for different traits are distributed to gametes independently of one another, leading to a variety of genetic combinations in the offspring.

Explanation

The statement that tropical rainforests accumulate more organic matter on the forest floor than temperate grasslands is incorrect.

In reality, the decomposition rate in tropical rainforests is so rapid due to high temperatures and humidity that organic matter does not accumulate significantly on the forest floor.

In contrast, temperate grasslands may accumulate more organic matter over time due to slower decomposition rates caused by cooler temperatures and seasonal variations.

Explanation

When crossing CC (homozygous dominant) with Cc (heterozygous), the possible genotypes of the offspring are:

CC (from C and C)

Cc (from C and c)

The genotype distribution is:

CC: 50% (or 1/2)

Cc: 50% (or 1/2)

So, the proportion of homozygous dominant (CC) offspring is 1/2.