Variation And Inhertitence Flashcards
(24 cards)
What is the differences between members of the same species known as?
Variation
What does discrete variation describe?
Differences which can be grouped into distinct sets
What is 2 examples of discrete variation?
Flower colour
Eye colour
What does continuous variation describe?
Differences which show a large range of values, between maximum and minimum
What is an example of continuous variation?
Height
How does variation in a species occur?
Combining of different genes through sexual reproduction
What is discrete variation controlled by?
Single gene
What is continuous variation controlled by?
Multiple genes (polygenic)
What are alleles?
Different forms of a particular gene?
What type of alleles do you get?
Dominant and reccessive
What trait will be seen if an organism only has dominant alleles?
Dominant trait
What letter are dominant alleles represented by?
Capital letter
What trait will be represented if an organism only has recessive alleles?
recessive trait
What letter are you recessive letters represented by?
Lower case letter
What trait will be represented if an organism has both dominant and recessive allele?
Dominant
What are the alleles that an organism is represented by?
Genotype
What are the physical features that appear as a result of these alleles?
Phenotype
2 of the same allele?
Homozygous
2 of the different allele?
Heterozygous
What does P alleles represent?
Parental generation
What does F1 alleles represent?
First offspring
What does F2 alleles represent?
2nd generation offspring
What do we use a punnet square for?
Calculate the expected outcome of breeding cross
Why might the expected phenotype ratios not be seen?
Fertilisation random process
Too few offspring produced
