Blog

A streaming service wants to conduct a survey about its original shows and movie offerings. The company’s researchers divide subscribers into groups based on age: 18–24, 25–34, 35–44, 45–54, and 55 and older. They then select a random sample from each age group. The streaming service is using a ____.

Define negative feedback. Describe one example of negative feedback. Be specific to demonstrate an example. 

List two functions of the circulatory (cardiovascular) system. 

In a species of rabbit, fur colour is controlled by a single gene with multiple alleles:  black fur is dominant white fur is dominant  both black and white are dominant over albino fur  Answer the following questions. Using the 3 specific phenotypes above explain the principle of Codominance. Include the definitions and specific examples for codominance, heterozygous and homozygous genotypes. (4 marks) Is it possible for a heterozygous black male rabbit and a heterozygous white female rabbit to have an albino offspring? Explain why or why not, making sure to include the genotype of the parents that would be required for this to be possible. (2 mark)

In the double helix structure, the two strands of DNA are held together in the centre by which specific components?

A gene exists in two different forms (B and b). With respect to the allele present, which type of gamete can a homozygous recessive individual produce?

In pea plants, the allele for tall stems is dominant to the allele for short stems. The parents of the F1 generation are  purebred tall and purebred short. What is the resulting offspring of the F1 generation. 

Complete the reaction for Beta Decay (note use the letter B for beta decay).  a) Bismuth – 213 undergoes beta decay. Show the complete reaction.  b) strontium-90 undergoes alpha decay. Show the complete reaction    

Name the following compounds a) Fe2(C2O4)3  b) SiS2 Provide the chemical formula for the following: c) paladium (IV) chromate nonahydrate d) dinitrogen pentoxide  

Which of the following compounds is nonpolar despite containing polar covalent bonds