The tobacco plant has 48 chromosomes in each of its leaf cells. The male gametes of a tobacco plant are inside its pollen grains. How many chromosomes are there in the male gamete of a tobacco plant?
Important Questions on Genes
The Netherlands Twin Register(NTR) collects data on physical and mental health, lifestyle and personality. Surveys in 1993-1995 and 2009-2010 recorded how many young adult twins had been cigarette smokers or had never smoked.
Complete the table by calculating the percentage who had smoked.
Display the data in a graph or chart. Only display the numbers that you think are significant and choose a format that you considered most suitable.
What changes in smoking behaviour took place in the Netherlands between 1993-1995 and 2009-2010?
There is a drop-off smoker in between the years 2009-2010. Is this change likely to be a consequence of a change in genes or the environment? Explain your answer.
How could the data collected by NTR (The Netherlands Twin Register) be used to investigate whether gene influence smoking behaviour?
The Swedish Twin Register collected data on smoking behaviour for identical twins and non-identical twins who had been reared in the same or different families. Data for twin boys are shown in the table.
Which are more similar in their smoking behaviour-identical twins or non-identical twins?
