Question 5:
Diagram 4 shows the arrangement of homologous chromosomes for two different individuals.
(a) Each chromosome contains a long DNA molecule.
State the content in DNA molecule which determines an individual’s characteristic. [1 mark]
(b) Based on Diagram 4, state the type of mutation experienced by individual Q. [1 mark]
(c) A doctor wants to detect the abnormalities at individual Q during pregnancy.
State two methods that can be used to detect the abnormalities.
[2 marks]
(d) Based on Diagram 4, state
(i) the number of chromosomes for individuals P and Q
(ii) the gender of individuals P and Q.
[2 marks]
Answer:
(a) Gene
(b) Chromosomal mutation.
(c)(i) Amniocentesis method
(c)(ii) Karyotype method
(d)(i) – Individual P : 46 chromosomes
– Individual Q : 47 chromosomes
(d)(ii) – Individual P : Male
– Individual Q : Female
Diagram 4 shows the arrangement of homologous chromosomes for two different individuals.
(a) Each chromosome contains a long DNA molecule.
State the content in DNA molecule which determines an individual’s characteristic. [1 mark]
(b) Based on Diagram 4, state the type of mutation experienced by individual Q. [1 mark]
(c) A doctor wants to detect the abnormalities at individual Q during pregnancy.
State two methods that can be used to detect the abnormalities.
[2 marks]
(d) Based on Diagram 4, state
(i) the number of chromosomes for individuals P and Q
(ii) the gender of individuals P and Q.
[2 marks]
Answer:
(a) Gene
(b) Chromosomal mutation.
(c)(i) Amniocentesis method
(c)(ii) Karyotype method
(d)(i) – Individual P : 46 chromosomes
– Individual Q : 47 chromosomes
(d)(ii) – Individual P : Male
– Individual Q : Female