Biology_2020_STPM term 3 Trial_ SMK Sepagaya Lahad Datu

Two type of variations P and Q, are shown in the diagram.

Which is true about P and Q?

• Ⅰ and Ⅱ

• Ⅰ and Ⅳ

• Ⅱ and Ⅲ

• Ⅲ and Ⅳ

In a study done by a group of biologist on Aristelliger lizard, it is found that small lizards have a hard time defending their territories, while large lizards are more likely to be preyed upon by owls. Therefore, the average-sized lizards have chance to survive. Which type of section is correct about the study?

• Natural

• Disruptive

• Stabilising

• Directional

Which statement best describes polymorphism?

• It makes organisms better adapted to survive in a certain environment.

• It gives a special modification naturally with attractive characteristics.

• It exists in different phenotypic variants within the same species.

• It is heritable and can be modified by natural selection.

The diagram shows a type of selection process.

The arrow shows the direction of natural selection. Which of the following examples can be explained using the diagram shown?

• Increased survival rate for the newly born human babies with average weight.

• Increased in antibiotic resistance among pathogenic bacteria.

• Formation of two subpopulation of grass: toxic-tolerant and non-tolerant grasses

• Increased population of trees with average height in the forest as compared to short and tall trees.

The examples of reproductive isolating mechanism in the formation of new species are given below.

Ⅰ. Two populations of lizard live in two different islands.

Ⅱ. Two different populations of buffalo mate and their offspring are sterile.

Ⅲ. Two different populations of fish mate but their offspring fail to develop.

Ⅳ. Two different populations of snails line in the same area but do not mate due to different structure of the reproductive organ.

Which statements are the examples of post-zygotic isolating mechanisms?

• Ⅰ and Ⅱ

• Ⅰ and Ⅳ

• Ⅱ and Ⅲ

• Ⅲ and Ⅳ

The frequency of the melanic form of the peppered moth, Biston belaturia, found in individualised areas of Britain is increased compared to the pale form of the peppered moth. This is result of

• adaptive radiation

• natural selection

• Convergent evolution

• divergent evolution

Which of the following has a greater chance of occurring when a population is small?

• Mutation

• Natural selection

• Genetic drift

• Gene flow

Which of the following has developed mainly as a result of artificial selection?

• Increased tolerance of lichens to heavy metals on tree bark around mines.

• Increased production of antibiotics by fungus, Penicillium sp.

• Darker colouring of the peppered moth, Biston betularia near industrial area.

• Increased resistance of rats to anticoagulant poison.

A cross between an Antirrhinum plant with alleles, RR for red flowers and an Antirrhinum plant with alleles, WW for white flowers produced heterozygous, RW offspring with pink flowers. What is the percentage of the progeny to have pink flowers if a cross is made between RW and RW?

• 0%

• 25%

• 50%

• 75%

The coat colour in mice is controlled by several alleles. C represents normal colour, C^ch Himalaya colour, and c an albino. The hierarchy of dominance of allele is C > C^ch > C^ch > c. If a cross between a chinchilla mice and a Himalayan mice produces chinchilla and Himalayan offspring in the ratio 1 : 1, which is true of the parental genotypes of the mice?

• C^chC^ch x C^hC^h

• C^chC^h x C^chC^h

• C^chC^h x C^hC^h

• C^chc x C^hc