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WorksheetsChapter 26 Quiz 1
Total questions: 7
Worksheet time: 4mins
A DNA molecule consists of two polynucleotide strands that twist around each other to form a (a)______________. The strands are held together by (b)______________ bonds between the nitrogenous bases.
(a) single helix, (b) hydrogen
(a) double helix, (b) hydrogen
(a) double helix, (b) covalent
Genes are segments of DNA located on (c)______________. They control body characteristics by controlling the types of (d)_______________ made.
(c) proteins, (d) chromosomes
(c) chromosomes, (d) proteins
(c) chromosomes, (d) carbohydrates
A gene may have two or more alternative forms called alleles. When an organism contains two different alleles of the same gene, it is described as a (e)______________. The allele that expresses itself in such a condition is said to be (f)______________.
(e) homozygote, (f) dominant
(e) homozygote, (f) recessive
(e) heterozygote, (f) dominant
(e) heterozygote, (f) recessive
In pea plants, the colour of flowers is controlled by a pair of alleles. The allele for purple flowers (F) is dominant to the allele for white flowers (f). A pure-breeding purple-flowered plant is crossed with a pure-breeding white-flowered plant.
What is the other term used for ‘pure-breeding’ in genetics?
homozygous
heterozygous
In pea plants, the colour of flowers is controlled by a pair of alleles. The allele for purple flowers (F) is dominant to the allele for white flowers (f). A pure-breeding purple-flowered plant is crossed with a pure-breeding white-flowered plant.
State the genotype of the pure-breeding purple-flowered plant and the pure-breeding white-flowered plant.
Purple – FF; white – ff
Purple – Ff; white – ff
Purple – FF; white – Ff
In pea plants, the colour of flowers is controlled by a pair of alleles. The allele for purple flowers (F) is dominant to the allele for white flowers (f). A pure-breeding purple-flowered plant is crossed with a pure-breeding white-flowered plant.
State the phenotype(s) of the F1 plants.
FF
Ff
ff
FF and ff
In pea plants, the colour of flowers is controlled by a pair of alleles. The allele for purple flowers (F) is dominant to the allele for white flowers (f). A pure-breeding purple-flowered plant is crossed with a pure-breeding white-flowered plant. An individual from the F1 generation is crossed with a pure-breeding white-flowered plant.
State the expected phenotypic ratio in the F2 generation.
1 : 3
3 : 1
