In a plant species, flower colour yellow is dominant over white and fruit shape round is dominant over elongated. Crossing was performed between two pure lines - one having yellow-flower and round-fruit and another with white-flower and elongated-fruit. About 20 plants survived in F₁ progeny. Plants of F₁ were allowed to self-fertilise and about 960 plants survived in F₂. If the traits follow Mendelian inheritance, the number of plants would have yellow-flower and round-fruit in F₁ and F₂ are respectively

• 20, 960

• 20, 540

• 10, 180

• 10, 60

A set of genes will be in a complete linkage when the progeny phenotypes for parental (P) and recombinant (R) types are

• P = 0%, R =100%

• P = 50%, R = 50%

• P < 50%, R > 50%

• P = 100%, R = 0%

Persons suffering from sickle-cell anaemia normally do not suffer from

• cholera

• malaria

• high blood pressure

• hepatitis

Which one of the following information is essential to, determine the genetic map distance between two genes located on the same chromosome?

• Length of the particular chromosome

• Number of genes present in the particular chromosome

• Number of nucleotides in the particular chromosome

• Percentage of crossing over or recombinant frequency between the two genes

Which one of the following statements is relevant to sex linked characters?

• They always follow criss-cross inheritance

• They do not follow criss-cross inheritance

• They are mostly present on Y-chromosome

• They are only present on X-chromosome

A male rabbit of genotype 'AABBDDEE' is crossed with a female rabbit of genotype 'aabbddee' to produce F₁ hybrid offspring. How many genetically different gametes can be produced by this F₁ hybrid?

• 4

• 8

• 16

• 32

Match the items in column I with those in column II and choose the correct answer.

• A- 1; B- 2; C- 3; D- 4

• A- 2; B- 3; C- 4; D- 1

• A- 3; B- 4; C- 1; D- 2

• A- 4; B- 1; C- 3; D- 2

218.

Choose the correct statements regarding genetic disorders.

I. Turner's female is result of aneuploidy.

II. Tritanopia is a sex-linked recessive disorder.

III. Haemophilia-C follows criss-cross pattern of inheritance.

IV. Sickel cell anaemia is due to mutation of alleles in chromosome 11.

• I, IV

• II, III

• I, III

• II, III

The type of mutation in the nucleotide sequence given below is

• Transition

• Transversion

• Deletion

• Inversion

Marfan syndrome, a dominant single gene defect is characterised by lens dislocation, long limbs, spindly fingers, caved in chest and weakened aorta. This is an example of

• Complete dominance

• Epistasis

• Pleiotropy

• Codominance