NSC Life Sciences Meiosis: Which ONE of the following refer

Question

Which ONE of the following refers to gradual change in the structure of organisms over time?
A) National selection
B) Evolution
C) Speciation

Study the mechanisms below:

(i) Species-specific courting behaviour
(ii) Interbreeding between two different populations
(iii) Breeding at different times of the year

Which ONE of the following combinations represents reproductive isolation?

A) (i), (ii), and (iii)
B) (ii) and (iii) only
C) (i) and (ii) only
D) (i) only

A sample of DNA has 60 guanine bases and 30 adenine bases.

How many phosphate molecules would you expect in this sample?

A) 60
B) 30
C) 90
D) 120

The theory of evolution has been supported by a comparative study of the structure of vertebrate forelimbs from the fossil record.

Which ONE of the following describes this statement above?

A) Genetic drift
B) Adaptive radiation
C) Natural selection
D) Biogeography

The table below compares the rate of extinction of mammal species over different time periods.

| TIME PERIOD (YEARS) | RATE OF EXTINCTION (PER 100 YEARS) |
|---------------------|-------------------------------------|
| 1900-1950           | 49                                  |
| 1950-2000           | 40                                  |

What is the ratio between the rate of extinction from 1950 to 2000 compared to the rate of extinction from 1900 to 1950?

A) 1 : 2
B) 1 : 1.2
C) 1 : 1.5
D) 2 : 1

Study the following effects:

(i) The double helix DNA will unwind during DNA replication.
(ii) RNA will replicate from double polynucleotide.
(iii) The hydrogen bonds in DNA will break to allow the DNA to take place.

Which ONE of the following combinations of effects will result if the hydrogen bonds are too strong?

A) (i), (ii), and (iii)
B) (ii) and (iii) only
C) (i) and (ii) only
D) (ii) only

The mutation …

A) will result in an extra chromosome.
B) will result in a different protein if this amino acid is added.
C) will produce a different protein in a different amino acid.
D) will cause a frameshift.

Which ONE of the following describes the mutation?

A) Klinefelter syndrome
B) Xeroderma pigmentosum
C) Albinism
D) Cystic fibrosis

The diagram below shows the pattern of inheritance of a disorder.

(figure)

One can conclude that the disorder is caused by a:

A) recessive allele with both parents heterozygous.
B) dominant allele, with one parent heterozygous while the other homozygous recessive.

1.1.1 Which ONE of the following refers to gradual change in the structure of organisms over time?

1.1.2 Study the mechanisms below:

1.1.3 A sample of DNA has 60 guanine bases and 30 adenine bases. How many phosphate molecules would you expect in this sample?

1.1.4 The theory of evolution has been supported by a comparative study of the structure of vertebrate forelimbs from the fossil record. Which ONE of the following describes this statement above?

1.1.5 What is the ratio between the rate of extinction from 1950 to 2000 compared to the rate of extinction from 1900 to 1950?

1.1.6 Study the following effects:

1.1.7 The mutation …

1.1.8 The diagram below shows the pattern of inheritance of a disorder. One can conclude that the disorder is caused by a:

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