Year 11 IGCSE Random Bio Quiz

What term is given to an organism that carries two identical alleles of a gene

• heterozygous

• homozygous

• dominant

• recessive

What term is given to an organism that carries two different alleles of a gene

• homozygous

• dominant

• heterozygous

• recessive

What term is used to describe the observable features that an organism has due to the alleles that it carries?

• genotype

• inheritance

• phenotype

• dominant characteristic

What word is used to describe a version of a gene?

• genotype

• phenotype

• allele

• chromosome

Which of the following is true of a dominant allele?

I. it is always expressed if it is present

II. two copies are needed to show its feature

III. it always causes a genetic disease

• I only

• I and II only

• II only

• I and III only

Cystic fibrosis is a lung disease caused by a recessive allele, c.

Two healthy parents produce a child with cystic fibrosis.

Which of the following statements must be true?

• One parent must be homozygous and the other must be heterozygous

• Both parents must be homozygous

• One parent must be homozygous and the other must be heterozygous

• Both parents must be heterozygous

Which of the following statements are true of codominance?

I. Both alleles are expressed in a person who is heterozygous

II. More than two phenotypes are usually possible

III. The ABO blood group system is an example of it

• I and II only

• I and III only

• II and III only

• I, II and III

Which of the following shows the female reproductive parts of a flower?

• anther, filament, ovary, ovule

• stigma, filament, ovary, ovule

• stigma, style, ovary, ovule

• anther, filament, ovary, ovule

Which of the following about pollination is true?

• Cross-pollination occurs between flowers of same plant.

• Cross-pollination occurs between flowers of different plants that is of the same species.

• Self-pollination occurs between flowers of different plants.

• Cross-pollination occurs between flowers of different plants that is of different species.

The diagram shows a wind-pollinated flower. Which of the following characteristics must this flower have?

(Select all correct answers.)

• Flower is scented.

• Petals are dull in colour.

• Anthers hang out of the flower.

• Stigma is large and feathery.