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WorksheetsApps S2 week 1 review
Total questions: 20
Worksheet time: 12mins
Aphids are a common pest that feed on tomato plants. However, some tomato plants contain a gene which produces a toxin, providing the plants with resistance to aphids. What is the most likely cause of this resistance?
Crossing over during prophase I
Mutation
Independent assortment of chromosomes during metaphase I
Sexual reproduction
What can be defined as 'The observable characteristics of an organism that depend on the genotype & the environment'?
Genome
Genotype
Phenotype
Gene pool
What can be defined as 'all of the organisms of one species that live in a habitat'?
Community
Population
Species
Genome
What can be defined as 'the total number of all alleles of all genes of all individuals within a population at a given time'?
Gene pool
Genome
Genotype
Phenotype
A cell that contains one set of chromosomes is called?
Diploid
Haploid
Somatic
Germ line
Which of these is not a cause of variation within a species?
Mutations
Meiosis
Mitosis
The environment
What is the correct equation to show the effect that genes and the environment have on the phenotype of an organism?
Which of the following statements do NOT apply when phenotypic differences are qualitative?
The differences fall into distinct categories with no intermediates
Variation is discontinuous
Variation would show a bell shaped curve on a graph
Variation is continuous
Which of the following statements do NOT apply when phenotypic differences are quantitative?
The differences do not fall into distinct categories with no intermediates
Variation is discontinuous
Variation would show a bell shaped curve on a graph
Variation is continuous
If variation is mainly due to genetic factors with the environment having little influence on the phenotype, it is usually controlled by a single gene. True or false?
True
False
What can be defined as 'the production of desired changes in the phenotype of an organism by artificially selecting as parents those individuals which show the desired phenotype to a larger degree than other individuals'.
Natural selection
Selective breeding
Evolution
Cloning
Which of the following form the stamen within a flower (male reproductive parts)?
Anther
Filament
Stigma
Style
Sepal
Which of the following form the carpel within a flower (female reproductive parts)?
Anther
Filament
Stigma
Style
Sepal
What name is given to flowers that contain both male and female reproductive parts?
Bisexual
Unisexual
Hybrid
Clone
What is the role of the endosperm during plant reproduction?
To fertilise the ovule
To combine with the ovary
To provide nourishment for the embryo
To make a seed
What can be defined as 'the proportion of phenotypic variation that is genetic'?
Genotype
Genome
Heritability
Gene pool
A heritability value of less than what will mean selective breeding has little effect?
2.0
0.2
0.02
0.002
What can be defined as 'self pollination, that is possible in most crop plants as they contain both male and female flowers on the same plant, or male and female parts within the same flower'?
Selfing
Hybridisation
Pure breeding
Heritability
Which of the following statements apply to single plant selection methods of selective breeding?
A single plant with the desired trait is selected
Offspring are kept separate as breeding lines and selfed over many generations
Genetic diversity increases
Each breeding line produces a new variety
Which of the following statements apply to hybridisation as a method for selective breeding in plants?
Usually produces offspring with a combination of more than one desired phenotype
Involves parent plants from two inbred lines being cross pollinated
Plants must be emasculated to remove the stamens
The first generation of offspring are self pollinated
