Principles of Inheritance and Variation

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Principles of Inheritance and Variation - 02

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Mrs. Surabhi Mukherjee, (M.Sc., Biotechnology, B.Ed., gurucoolclasseslko@gmail.com)

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Q1. When ‘Aa’ is crossed with ‘aa’, (A is dominant over a) *

1 point

75% of offspring will have dominant phenotype and 50% will have recessive phenotype.

50% of offspring will have dominant phenotype and 50% will have recessive phenotype.

all the offspring will have recessive phenotype.

all the offspring will have dominant phenotype.

Q2. A heterozygous violet-flowered pea plant is crossed to another homozygous violet- flowered pea plant. What percent of the progeny plants will have the recessive trait, i.e., white flowers? *

1 point

25%

50%

75%

Q3. From a cross AABb x aaBb, the genotypes AaBB : AaBb : Aabb will be obtained in the ratio *

1 point

2:1:2

2:1:1

1:2:1

1:1:2

Q4. The possibility of all genotypes of offspring in a genetic cross is calculated by a graphical representation which was developed by *

1 point

Gregor Mendel

Reginald Punnett

Komberg

T.H. Morgan

Q5. A woman with normal vision has a colorblind father. She marries a colourblind man. What proportion of their children will be colourblind? *

1 point

100%

50%

25%

Q6. Mother and father of a person with ‘O’ blood group have ‘A’ and ‘B’ blood group respectively. What would be the genotype of both mother and father? *

1 point

Both mother and father are homozygous for ‘A’ and ‘B’ blood group, respectively.

Both mother and father are heterozygous for ‘A’ and ‘B’ blood group, respectively.

Mother is homozygous for ‘A’ blood group and father is heterozygous for ‘B’.

Mother is heterozygous for ‘A’ blood group and father is homozygous for ‘B’.

Q7. The inheritance pattern of a gene over generations among humans is studied by the pedigree analysis. Character studied in the pedigree analysis is equivalent to *

1 point

Polygenic trait.

Maternal trait.

Quantitative trait.

Mendelian trait.

Q8. Occasionally, a single gene may express more than one effect. The phenomenon is called *

1 point

mosaicism

pleiotropy

multiple allelism

polygeny.

Q9. onditions of a karyotype 2n ± 1 and 2n ± 2 are called *

1 point

Polyploidy

Monosomy

Aneuploidy

Allopolyploidy

Q10. If a genetic disease is transferred from a phenotypically normal but carrier female to only some of the male progeny, the disease is *

1 point

Autosomal recessive

Sex-linked dominant

Autosomal dominant

Sex-linked recessive

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