NSC Life Sciences Mitosis and Meiosis: Various options are provided as

Question

Various options are provided as possible answers to the following questions. Choose the answer and write only the letter (A to D) next to the question number (1.1.1 to 1.1.10) in the ANSWER BOOK.
 
1.1.1 The components of a DNA molecule that provide the code for protein synthesis are the ...
A. sugars.
B. phosphates.
C. hydrogen bonds.
D. nitrogenous bases.

1.1.2 During which stage of meiosis do spindle fibres begin to form?
A. Prophase
B. Metaphase
C. Anaphase
D. Telophase

1.1.3 An individual has Down syndrome, in the karyotype there is an abnormal number of chromosomes at chromosome pair ...
A. 13.
B. 16.
C. 21.
D. 23.

1.1.4 An individual that has received an identical allele from each parent is described as being ...
A. homozygous.
B. heterozygous.
C. dominant.
D. recessive.

1.1.5 A plant species has a diploid chromosome number of 12. 
Which ONE of the following is the haploid chromosome number?
A. 12
B. 24
C. 6
D. 36

1.1.6 Inheritance by multiple alleles in genetics refers to ...
A. one allele that influences two characteristics.
B. two alleles that influence one characteristic.
C. three or more alleles that influence one characteristic.
D. one allele that influences two characteristics.

1.1.7 Which ONE of the following is a reproductive isolation mechanism?
A. Breeding at the same time of the year
B. Infertile offspring
C. Plant adaptation to the same pollinators
D. Improved fertilisation

1.1.8 Normal humans have ...
A. 2 autosomes and an X chromosome.
B. 23 autosomes and an X chromosome.
C. 22 autosomes and a Y chromosome.
D. 23 autosomes and a Y chromosome.

1.1.9 Which ONE of the following occurs in mitosis but NOT in meiosis?
A. Two cells are formed at the end of division
B. Crossing over takes place
C. Homologous chromosomes arrange at the equator
D. Centrioles form at the poles of the cell

1.1.10 The graph below shows the percentage similarity between human (Hu) DNA and the DNA of some species of African apes.

(Insert image reference)
Which ONE of the following phylogenetic trees best represents the information in the graph?
A. Hu (ch)
B. Gi, Rm, Ch, Hu.
C. Ga, Rm, Ch, Hu.
D. Ga, Rm, Ch, Hu.

Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2022 - Paper 2

Worked Solution & Example Answer:Various options are provided as possible answers to the following questions - NSC Life Sciences - Question 1 - 2022 - Paper 2

1.1.1 The components of a DNA molecule that provide the code for protein synthesis are the ...

1.1.2 During which stage of meiosis do spindle fibres begin to form?

1.1.3 An individual has Down syndrome, in the karyotype there is an abnormal number of chromosomes at chromosome pair ...

1.1.4 An individual that has received an identical allele from each parent is described as being ...

1.1.5 A plant species has a diploid chromosome number of 12. Which ONE of the following is the haploid chromosome number?

1.1.6 Inheritance by multiple alleles in genetics refers to ...

1.1.7 Which ONE of the following is a reproductive isolation mechanism?

1.1.8 Normal humans have ...

1.1.9 Which ONE of the following occurs in mitosis but NOT in meiosis?

1.1.10 The graph below shows the percentage similarity between human (Hu) DNA and the DNA of some species of African apes. Which ONE of the following phylogenetic trees best represents the information in the graph?

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