IGCSE Biology Using Organisms

What is an allele?

• an organisms genome

• different versions of the same gene

• same versions of different genes

• different chromosomes

Why did population of white peppered moths decrease during the industrial evolution?

• White moths were better camouflaged so they, survived and bred.

• Black moths were better camouflaged so they, survived and bred.

• White moths were better camouflaged so they were more likely to be eaten by predators.

• Black moths were better camouflaged so they were more likely to be eaten by predators.

What is not an advantage of selective breeding crops?

• Lower yield

• Drought resistance

• Larger plants

• Better flavours

Which of the following could be used as a vector for a human gene?

• Bacterial Plasmid

• Bacteria

• A mitochondria

• mRNA

Which enzyme glues DNA together?

• Ligase

• Polymerase

• Helicase

• Sucrase

"transgenic" refers to an animal that:

• Has DNA from another species spliced into its genome

• Has undergone DNA modification

• Has unique genes for its species

In which ways can genetic engineering can improve crops

• Make them pest or drought resistant

• Make them more nutritious

• Make them larger

• All answers are correct

Tags

NGSS.MS-LS3-1

A circular piece of DNA, found in bacteria, is called:

• A plasmid

• mRNA

• Ribosome

• Nucleotide

Which of these are disadvantages of Inbreeding ( Selective Breeding) ?

• Reducing Gene Pool

• Genetic Defects

• Higher Risks of Cancers

Which one is Selective Breeding?

• Humans artificially Select which animals Breed to get the best possible offspring

• Transferring a gene responsible for desirable characteristics from one organism to another