Genetic Inheritance (OCR GCSE Biology A (Gateway Science Suite)): Quizzes
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Practise the questions
13 questions from this quiz
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Practise the questions
13 questions from this quiz
How many chromosomes do human gametes contain?
How many chromosomes do human gametes contain?
23
What term describes cells with only one set of chromosomes?
What term describes cells with only one set of chromosomes?
Haploid
What proteins do chromosomes consist of DNA coiled around?
What proteins do chromosomes consist of DNA coiled around?
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 inherit?
How many alleles for each gene do humans inherit?
Two alleles (one from each parent)
How many copies of a dominant allele are needed for expression?
How many copies of a dominant allele are needed for expression?
Only one copy
When is a recessive allele expressed in the phenotype?
When is a recessive allele expressed in the phenotype?
When two copies are present
Which genotype is homozygous?
Which genotype is homozygous?
AA
Which genotype represents a heterozygous organism?
Which genotype represents a heterozygous organism?
Aa
What does phenotype refer to?
What does phenotype refer to?
Observable physical/physiological traits
In Punnett squares, how are recessive traits represented?
In Punnett squares, how are recessive traits represented?
Lowercase letters
In a Bb x Bb cross, what is the chance of Bb offspring?
In a Bb x Bb cross, what is the chance of Bb offspring?
50%
In a Bb x Bb cross, what % show the dominant trait?
In a Bb x Bb cross, what % show the dominant trait?
75%