In a beetle species the red color is dominant over the white color. what is the genotype of any red beetle resulting from this species? 1points a red and white alleles present on one chromosome b red and white alleles present on two chromosomes c a red allele present on both homologous chromosomes d a red allele present on at least one of two homologous chromosomes

Option D, A red allele present on at least one of two homologous chromosomes

Explanation:

It is given that in a beetle species the red color is dominant over the white color. Thus, in order to have a offspring of red color at least one of the two homologous chromosome must have red allele.

This can be further understood from the cross below -

Suppose one of the parent is homozygous red  with genotype "RR" and other parent is homozygous white with genotype "rr"

If a cross is carried out between the two parents, the following offsprings will result -

RR x rr

Rr, Rr, Rr, Rr

Since there is no co dominance, thus the dominant allele will express itself completely and hence at least one of the homologous chromosome of  offspring must have red color allele.

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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.