F5 BIO CHP6 VARIATION2

Which of the following are genetically inherited human characteristics that are not affected by any changes in the environmental conditions?

I Skin colour

II Blood group

III Presence of a dimple

IV Height

• I and II

• I and III

• II and III

• III and IV

Which of the following statements is true?

• continuous variation produces many different characteristics within a population.

• discontinuous variation is due to genetically inherited characteristics

• the colour of the skin is an example of discontinuous variation.

• discontinuous variation is influenced by adaptation to the environment

The following information is about two individuals, X and Y.

*Individual X: presence of a dimple

*Individual Y: no dimple

Which of the following factors causes the difference in the trait between the two individuls?

• mutation

• genetics

• hormone

• environment

Variation in a trait may be due to the change in a genetic material.What do you call this type of change?

• radiation

• mutation

• inversion

• deletion

Which of the following sources can cause genetic variation in sexual reproduction?

I Random fertilisation

II Cell mutation

III Crossing over during prophase II

IV Independence assortment during metaphase I

• I AND II

• I AND IV

• II AND IV

• III AND IV

Diagram below shows an illustration of the gene sequence on a chromosome before and after exposure to radioactive radiation.

This is an example of .....

• deletion

• inversion

• duplication

• substitution

Diagram below shows a karyotype of an individual suffering from a genetic disease.

What is the genetic disease suffered by the individual?

• albinism

• sickle cell anaemia

• down's syndrome

• turner's syndrome

Which of the following shows mutation due to translocation of the chromosome?

• 
• 
• 
• 

Which of the following would increase the number of different alleles in a population?

• crossing over

• gene mutation

• random fusion of gametes

• independent assortment of chromosomes

Which of these features of butterflies is an example of discontinuous variation?

• Area of wings

• Length of body

• Length of legs

• Presence of spots