Populations, Evolutions & Genetics Random Retrieval

Between stages D and E, what will happen to light intensity at ground level?

What is lichen made out of ?

Which factor will the lichen and mosses change the most?

Which of the following is an example of primary succession?

What is the advantage of carrying out an interrupted belt transect compared to belt transect?

Was the reduction in insects caused by the cold weather an abiotic factor or a biotic factor?

Is the following an 'Abiotic adaptation' or a 'Biotic Adaptation': Monarch butterflies fly south when the number of daylight hours shorten?

What is the word used to describe 'Populations of different species in specific habitat'?

What type of speciation is caused by reproductive Isolation, but without a physical barrier between two populations?

Which type of selection is shown by fossils of black bears, showing them becoming bigger during glacial periods ( ice ages)?

Which type of selection is when the number of individuals with a particular characteristic, increase around a middle or mid value, and outliers decrease?

Natural Selection is when organisms which are better adapted are more likely to survive and pass on their genes. Factors which affect the chance of survival are called selection pressures. These can be positive ( advantageous) or negative ( disadvantageous). Which of these is a negative selection pressure?

Tay Sachs is a recessive disease which leads to the build up of certain lipids which eventually become toxic. The Cajun community in the USA has an incidence of about 1 in every 3,500 births. What is the number of homozygous dominant healthy individuals in a Cajun population of 100,000 people?

In peppered moths, having light coloured wings is dominant. In Sheffield (an industrial northern town in the UK) a sample of moths was taken. The numbers collected were 73 light coloured , and 326 dark coloured. How many are heterozygotes?

What is an autosome?

Being colour blind is a sex-linked disorder. What is the probability of an unaffected male having a colour- blind child with a heterozygous female?

Which type of allele tends to be sex linked?

How can you tell from a pedigree (family tree) that a trait is sex linked?

What does the term 'Codominance' mean?

In guinea pigs, Short hair (S) is dominant to long hair (s). In a monohybrid cross between a heterozygous mother, with a heterozygous father, what ratio of long hair to short hair will the offspring have ?