GR 12 GENETICS: Exam Practice Booklet M\C PART 1

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Exam Practice Questions Booklet Multiple Choice Questions 1.1 - 1.15

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1.1 When an individual that is homozygous dominant for a particular characteristic is crossed with an individual that is homozygous recessive for the characteristic, all the offspring would be ... *

A. homozygous dominant

B. homozygous recessive

C. heterozygous

D. pure-bred

1.2 A genetic cross where both alleles of a gene are equally dominant is an example of ... *

A. codominance

B. a dihybrid cross

C. incomplete dominance

D. complete dominance

1.3 Two red-eyed fruit flies were mated and they produced 150 flies with red eyes and 48 flies with white eyes. From this information we can reasonably conclude that the ... *

A. white-eyed condition is recessive and both parents are heterozygus.

B. red-eyed condition is dominant and both parents are homozygous for red eyes.

C. white-eyed condition is recessive and both parents are homozygous for red eyes.

D. red-eyed condition is recessive and both parents are heterozygous.

1.4 Which ONE of the following monohybrid crosses will result in a phenotypic ratio of 1 : 1? A cross where ... *

A. both parents are heterozygous.

B. both parents are homozygous for the dominant characteristic.

C. one parent is heterozygous and the other parent is homozygous recessive.

D. one parent is heterozygous and the other parent is homozygous dominant.

1.5 One reason why some people are opposed to genetic modification is that ... *

A. the use of herbicides is reduced.

B. crop yields are improved

C. the taste and quality of food is improved.

D. the potential impact on human health is unknown.

1.6 The genotype for an individual with blood group A is ... *

1.7 Four different phenotypes are possible in the F1 - generation if the parents' blood groups are ... *

A. B and B.

B. A and B

C. O and AB

D. AB and AB

1.8 The diagram below shows the alleles for height and flower colour in a flowering plant. The plant is ... *

A. homozygous for height and heterozygous for flower colour.

B. heterozygous for height and homozygous dominant for flower colour.

C. homozygous recessive for height and homozygous dominant for flower colour.

D. heterozygous for height and heterozygous for flower colour.

1.9 Which ONE of the following resulted from Gregor Mendel's experiments with pea plants? *

A. The 'law' of inheritance of acquired characteristics.

B. The principle of independent assortment.

C. The 'law' of use and disuse.

D. The theory of evolution.

QUESTIONS 1.10 AND 1.11 REFER TO THE INFORMATION BELOW.

In pea plants yellow seed colour (Y) is dominant over green seed colour (y). Smooth seed texture (S) is dominant over wrinkled seed texture (s)

A student crossed a plant which had yellow wrinkled seeds with a plant which had green smooth seeds.

1.10 Which ONE of the following shows possible alleles present in a gamete that is produced by the plant with yellow wrinkled seeds? *

A. YYss

B. yySS

C. yS

D. Ys

1.11 Which ONE of the following is a possible representation of the genotypes of the P1 generation? *

A. YYSS x yyss

B. Yyss x yySs

C. YYSS x yySs

D. Yyss x YySs

1.12 In a monohybrid cross, the genotype of all the F1-plants is Aa. If the F1-plants are crossed, what percentage of the F2-generation will have the dominant phenotype? *

A. 25

B. 50

C. 75

D. 100

1.13 How many alleles control the human blood group? *

A. 4

B. 3

C. 2

D. 1

QUESTION 1.14

1.14 *

1.15 A man with blood group A and a woman with blood group B have children. Their first child has blood group AB and the second child has blood group O. Which prediction about the blood groups of future children is CORRECT? *

A. Future children have a 50% chance of having blood group AB and 50% chance of havnig blood group O.

B. All will have blood group A or B.

C. Each future child will have an equal chance of having blood group A, B, AB or O.

D. None of the future children will have blood group A.

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