Page 114 - SUBSEC October 2017_Neat

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In tomatoes: R - red fruit (dominant)
r - yellow fruit 34. The genotype of human zygotes will differ
T - tall plant (dominant) from that of both parents and grandparents.
t - short plant
Which of the following occurrences does
Both genes are on different chromosomes. NOT contribute to this variation?

31. A tomato plant homozygous for allele R (A) Chiasmata occurring during meiosis
reproduces. The number of copies of this (B) Mutation of genes
allele which will be found in the male gamete (C) Presence of recessive genes
of this plant is (D) Random combination of gametes

(A) 1 35. The coding DNA triplet for glutamic acid is
(B) 2 CTT. This mutates to CAT in sickle cell
(C) 4 haemoglobin. The complementary mRNA
(D) 8 codon for sickle cell anemia is

(A) GAA
32. The characteristic of inflated pea pods is (B) GTC
controlled by one allele of a particular gene. (C) GTT
The other allele results in constricted pods. (D) GUA

Half the pollen grains of a heterozygous pea
36. Which of the following chromosomal
plant show the characteristic of inflated pods
mutations, labelled I - IV, is correctly
because alleles separate at meiosis during
identified?
(A) anaphase I and anaphase II
A B C D E F A B C F G I
(B) metaphase II and anaphase II
(C) prophase I and prophase II
A B C D C D E F G II
(D) metaphase I and anaphase I
A B E D C F G III

33. A woman who is heterozygous for sickle cell A B C M N O P IV
anaemia, marries a man who is also
heterozygous for sickle cell. The probability
(A) I - duplication
that their third child will carry a sickle cell
(B) II - translocation
allele is
(C) III - inversion
(D) IV - deletion
(A) 25%
(B) 50%
37. In which of the following events is variation
(C) 75%
NOT involved?
(D) 100%
(A) Segregation of chromosomes at
anaphase
(B) Chiasma formation in
chromosomes
(C) Structural changes in
chromosomes
(D) Pairing of X and Y
chromosomes

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02107010/SPEC 2017