A-Level AQA Biology Inheritance (A Level only): Mutation is one cause of genetic

Question

Mutation is one cause of genetic variation in organisms.

Give two other causes of genetic variation.

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In a species of flowering plant, the T allele for tallness is dominant to the t allele for dwarfness. In the same species, two alleles R^red (red) and C^W (white) code for the colour of flowers. When homozygous red-flowered plants were crossed with homozygous white-flowered plants, all the offspring had pink flowers.

Name the relationship between the two alleles that code for flower colour.

A dwarf, pink-flowered plant was crossed with a heterozygous tall, white-flowered plant.

Complete the genetic diagram to show all the possible genotypes and the ratio of phenotypes expected in the offspring of this cross.

Phenotypes of parents: Dwarf, pink-flowered x Tall, white-flowered

Genotypes of parents:

Genotypes of offspring:

Phenotypes of offspring:

Ratio of phenotypes:

A population of this species of plant contained 9% of red-flowered plants.

Use the Hardy-Weinberg equation to calculate the percentage of pink-flowered plants in this population.

Show your working.

Mutation is one cause of genetic variation in organisms - AQA - A-Level Biology - Question 6 - 2020 - Paper 1

Worked Solution & Example Answer:Mutation is one cause of genetic variation in organisms - AQA - A-Level Biology - Question 6 - 2020 - Paper 1

Give two other causes of genetic variation.

Name the relationship between the two alleles that code for flower colour.

Complete the genetic diagram to show all the possible genotypes and the ratio of phenotypes expected in the offspring of this cross.

Use the Hardy-Weinberg equation to calculate the percentage of pink-flowered plants in this population.

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