NSC Life Sciences Genetics and Inheritance: 1.1.1 In a DNA molecule …
A guan

Question

1.1.1 In a DNA molecule …
A guanine pairs with adenine.
B adenine pairs with thymine.
C cytosine pairs with adenine.
D guanine pairs with thymine.

1.1.2 The genotype for an individual with blood group A is …
A I^A I^A only.
B I^A I^O.
C I^O only.
D I^A or I^O.

1.1.3 Charles Darwin based the theory of evolution through natural selection on many observations.

Which ONE of his observations is represented in the diagram above?
A Limited environmental resources.
B Population remains over time.
C Individuals within a population vary widely.
D Only the fittest will survive.

1.2 Give the correct biological term for each of the following descriptions. Write only the term next to the question number (1.2.1 to 1.2.9) in the ANSWER BOOK.

1.2.1 Nitrogenous base found only in RNA molecules
1.2.2 The use of biological processes, organisms or systems to improve the quality of human life
1.2.3 Type of variation within a population in which there is a range of intermediate phenotypes
1.2.4 An upright posture and walking only on two legs
1.2.5 A sugar molecule found in a nucleotide of DNA
1.2.6 Genetic disorder resulting in the abnormal clotting of blood
1.2.7 Study of fossils
1.2.8 Present-day distribution of living organisms across the continents
1.2.9 Family to which humans belong (9 x 1)

1.4 Mendel observed some characteristics of the pea plant (Pisum sativum) which he suggested were controlled by inherited factors. He carried out a series of experiments in which he crossed pea plants with contrasting characteristics and obtained the offspring of the F1 generation. At first his crosses were simple and involved only one pair of characteristics.

Mendel counted the number of offspring showing each of the variations.

His results are shown in the table below.

|  PLANT PART  |  CHARACTERISTIC  |  P1 GENERATION  |  F1 GENERATION  |
|--------------|-------------------|------------------|------------------|
| Seed         | Seed texture       | Round x wrinkled  | All round        |
|              | Seed colour        | Yellow x green    | All yellow       |
| Pod          | Pod texture        | Full x constricted | All full         |
| Flowers      | Flower colour      | Violet x white     | All violet       |
| Stem         | Location of flower on stem | Axial x terminal | All axial       |
|              | Height of stem     | Tall x short      | All tall         |

1.4.1 Give the term for:

(a) the inherited factors that Mendel referred to
(b) A cross involving ONLY ONE characteristic

1.4.2 Name the male structure of the flower where meiosis occurs.

1.4.3 Use the information in the table above to give the NUMBER of EACH of the following:

(a) Characteristics of pods
(b) Alleles for seed characteristics

1.4.4 Give the characteristic that is:

(a) Dominant for flower colour

1.4.5 If individuals of the F1 generation are crossed, how many phenotypes for seed colour would be expected in the F2 generation?

1.5 The diagram below represents a process that occurs during protein synthesis.

Identify the process above.

1.5.1 Identify:

(a) Organelle A
(b) Molecule B
(c) The bond at E

1.5.3 Give only the LETTER of the molecule that:

(a) Carries the amino acid
(b) Is copied from DNA
(c) Is the monomer/building block of proteins.

1.1.1 In a DNA molecule … A guanine pairs with adenine - NSC Life Sciences - Question 1 - 2017 - Paper 2

Worked Solution & Example Answer:1.1.1 In a DNA molecule … A guanine pairs with adenine - NSC Life Sciences - Question 1 - 2017 - Paper 2

In a DNA molecule …

The genotype for an individual with blood group A is …

Which ONE of his observations is represented in the diagram above?

Give the correct biological term for each of the following descriptions.

Give the term for: (a) the inherited factors that Mendel referred to

Give the term for: (b) A cross involving ONLY ONE characteristic

Name the male structure of the flower where meiosis occurs.

Use the information in the table above to give the NUMBER of EACH of the following: (a) Characteristics of pods

Use the information in the table above to give the NUMBER of EACH of the following: (b) Alleles for seed characteristics

Give the characteristic that is: (a) Dominant for flower colour

If individuals of the F1 generation are crossed, how many phenotypes for seed colour would be expected in the F2 generation?

Identify the process above.

Identify: (a) Organelle A

Identify: (b) Molecule B

Identify: (c) The bond at E

Give only the LETTER of the molecule that: (a) Carries the amino acid

Give only the LETTER of the molecule that: (b) Is copied from DNA

Give only the LETTER of the molecule that: (c) Is the monomer/building block of proteins.

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