NSC Life Sciences Genetics and Inheritance: 1.1 The theory of evolution by n

Question

1.1 The theory of evolution by natural selection was first described by
A. Gregor Mendel.
B. Watson and Crick.
C. Jean Baptiste de Lamarck.
D. Charles Darwin.

1.1.2 When an individual that is homozygous dominant for a particular characteristic is crossed with an individual that is homozygous recessive for the characteristic, all the offspring would be ...
A. homozygous dominant.
B. homozygous recessive.
C. heterozygous.
D. pure-bred.

1.1.3 The absence of the protein melanin results in the disorder called ...
A. haemophilia.
B. colour-blindness.
C. albinism.
D. Down syndrome.

1.1.4 A hummingbird's long beak is said to be an adaptation to its feeding habits. The reason that Lamarck would have provided for the long beak of the hummingbird is that ...

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 1.2.7)
1.2.1 The organelle in the cytoplasm which is the site of protein synthesis.
1.2.2 The name of the bond that forms between amino acids in a protein molecule.
1.2.3 The process by which a DNA molecule makes identical copies of itself.
1.2.4 The name of the process when homologous chromosome pairs fail to separate during meiosis.
1.2.5 The permanent disappearance of a species from earth.
1.2.6 A testable statement that may be accepted or rejected.
1.2.7 The type of nucleic acid that carries a specific amino acid to ...

1.3 Indicate whether each of the descriptions in COLUMN A applies to A ONLY, B ONLY, BOTH A AND B or NONE of the items in COLUMN B. Write a only, b only, both A and B or none next to the question number (1.3.1 to 1.3.3).

1.3.1 The selection and breeding of organisms by humans.
A. Natural selection
B. Artificial selection

1.3.2 An allele that is shown/expressed in the phenotype when found in the
A. Dominant
B. Recessive

1.3.3 Pairing of nitrogenous bases
A. DNA
B. RNA

1.4 The diagram below shows a part of a DNA molecule.

(Insert diagram)

1.4.1 Provide labels for:
(a) 1
(b) 2
(c) 3

1.4.2 Give the number of nucleotides shown in the diagram.

1.4.3 Give ONE difference between the nitrogenous bases found in DNA molecules and those found in RNA molecules.

1.5 The diagram below represents a process that occurs during meiosis.

(Insert diagram)

1.5.1 Provide labels for:
(a) A
(b) B
(c) C
(d) D

1.5.2 Give the function of the structure labelled B.

1.5.3 Name:
(a) The phase in meiosis during which the process at C occurs.
(b) State ONE reason why process C is significant.

1.6 The diagram below represents the possible evolution of the horse.

(Insert diagram)

1.6.1 Name the:
(a) Common ancestor of all horses.
(b) Genus most closely related to Megahippus.

1.6.2 How long did it take for the modern horse to evolve from Hyracotherium?

1.1 The theory of evolution by natural selection was first described by A - NSC Life Sciences - Question 1 - 2016 - Paper 2

Worked Solution & Example Answer:1.1 The theory of evolution by natural selection was first described by A - NSC Life Sciences - Question 1 - 2016 - Paper 2

The theory of evolution by natural selection was first described by

When an individual that is homozygous dominant for a particular characteristic is crossed with an individual that is homozygous recessive for the characteristic, all the offspring would be ...

The absence of the protein melanin results in the disorder called ...

A hummingbird's long beak is said to be an adaptation to its feeding habits. The reason that Lamarck would have provided for the long beak of the hummingbird is that ...

1.2.1 The organelle in the cytoplasm which is the site of protein synthesis.

1.2.2 The name of the bond that forms between amino acids in a protein molecule.

1.2.3 The process by which a DNA molecule makes identical copies of itself.

1.2.4 The name of the process when homologous chromosome pairs fail to separate during meiosis.

1.2.5 The permanent disappearance of a species from earth.

1.2.6 A testable statement that may be accepted or rejected.

1.2.7 The type of nucleic acid that carries a specific amino acid to ...

1.3.1 The selection and breeding of organisms by humans.

1.3.2 An allele that is shown/expressed in the phenotype when found in the

1.3.3 Pairing of nitrogenous bases

1.4.1 Provide labels for: (a) 1

1.4.1 Provide labels for: (b) 2

1.4.1 Provide labels for: (c) 3

1.4.2 Give the number of nucleotides shown in the diagram.

1.4.3 Give ONE difference between the nitrogenous bases found in DNA molecules and those found in RNA molecules.

1.5.1 Provide labels for: (a) A

1.5.1 Provide labels for: (b) B

1.5.1 Provide labels for: (c) C

1.5.1 Provide labels for: (d) D

1.5.2 Give the function of the structure labelled B.

1.5.3 Name: (a) The phase in meiosis during which the process at C occurs.

1.5.3 Name: (b) State ONE reason why process C is significant.

1.6.1 Name the: (a) Common ancestor of all horses.

1.6.1 Name the: (b) Genus most closely related to Megahippus.

1.6.2 How long did it take for the modern horse to evolve from Hyracotherium?

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