Welcome to the Quiz!
This quiz contains 10 questions from a mix of 1 subtopics.
How many pairs of chromosomes do humans have?
22
24
23
25
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Which chromosomes determine an individual's sex?
all of them
the 22nd pair
the first pair
the 23rd pair
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Which chromosome is found only in males?
Y chromosome
neither X nor Y chromosomes
X chromosome
both X and Y chromosomes
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What are genes located on the X or Y chromosomes termed as?
sex cells
sex chromosomes
sex traits
sex-linked genes
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Why do recessive alleles on the X chromosome appear more often in males?
because there is no corresponding allele on the Y chromosome to mask them
because males have more X chromosomes
because the X chromosome is larger in males
because males are more prone to genetic disorders
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What is haemophilia?
a disorder caused by a recessive Y-linked allele
a disorder caused by a recessive X-linked allele
a disorder caused by a dominant X-linked allele
a disorder caused by a dominant Y-linked allele
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From whom do males always inherit the X chromosome?
neither parent
father
mother
both parents
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Who can affected fathers pass haemophilia to?
neither sons nor daughters
both sons and daughters
sons
daughters
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What does shading within a shape in a pedigree chart indicate?
the absence of a trait in the phenotype
the presence of a trait in the phenotype
the absence of a trait in the genotype
the presence of a trait in the genotype
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Which chromosome is larger in size?
Y chromosome
X chromosome
both are of the same size
the size varies from person to person
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