Populations, Evolutions & Genetics Random Retrieval

Which factor will the lichen and mosses change the most?

True or false : Succession involves only the change of biotic factors ( Not abiotic).

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

What should you use to estimate a population of a sessile organism?

A mild winter and a warm spring meant that the population of robins (birds which feed on insects) increased. This was due to the above average biomass of insects, so more young robins survived. However the following winter was very cold so fewer insects were available in the spring, and the robin population decreased. Is the decrease in robin population, intraspecific competition or interspecific competition?

Which type of selection is human birthweight showing? (As low birth - weight babies and high birth - weight babies are less likely to survive)

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?

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?

Which of the following is not a cause of variation?

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?

Drosophila fruit flies can have either vestigial wings (w)or wild-type wings (W). If 20% of the population have vestigial wings, what proportion of the population are homozygous dominant?

What does 'p' represent ?

This gene interaction once again alters the phenotype ratio. Which type of Epistatic allele will produce a ratio of 9:3:4?

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?

What does the term 'Codominance' mean?

What is the best definition of a 'recessive allele'?

What is the definition of 'allele'?

What is the definition of 'phenotype'?

What is the definition of 'genotype'?