Genetic Inheritance (OCR GCSE Biology A, Combined (Gateway Science Suite)): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
ShowHide
Practise the questions
12 questions from this quiz
How many chromosomes do human gametes contain?
How many chromosomes do human gametes contain?
23
What are the proteins called that DNA coils around in chromosomes?
What are the proteins called that DNA coils around in chromosomes?
Histones
What does a gene contain instructions for building?
What does a gene contain instructions for building?
A specific protein
How many alleles for each gene do humans have?
How many alleles for each gene do humans have?
Two
How many copies of a dominant allele are needed for it to be expressed in the phenotype?
How many copies of a dominant allele are needed for it to be expressed in the phenotype?
One
How many copies of a recessive allele are needed for it to be expressed?
How many copies of a recessive allele are needed for it to be expressed?
Two
Which genotype is homozygous?
Which genotype is homozygous?
AA
Which genotype is heterozygous?
Which genotype is heterozygous?
Aa
What is the phenotype of an organism?
What is the phenotype of an organism?
Observable physical traits
In Punnett square notation, how are dominant traits represented?
In Punnett square notation, how are dominant traits represented?
Uppercase letters
In a Bb × Bb cross, what percentage of offspring have genotype Bb?
In a Bb × Bb cross, what percentage of offspring have genotype Bb?
50%
In a Bb × Bb cross, what percentage of offspring show the dominant trait?
In a Bb × Bb cross, what percentage of offspring show the dominant trait?
75%