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Living for the future
What is the unit of inheritance called?
Which statement about the inheritance of gender is correct?
Males are XX and females are XY.
Egg cells can carry X chromosomes or Y chromosomes.
Sperm cells can carry X chromosomes or Y chromosomes.
Identical twins are very similar to each other mainly because:
They were born within minutes of each other.
They have identical genetic information.
They have the same parents.
Which of the following human characteristics is caused by environmental variation?
Sex (male or female)
What are alleles?
Different forms of a chromosome.
Different forms of a gene.
Different genes in a chromosome.
In a genetic diagram, how is a dominant allele shown?
As a bold letter.
As a capital letter.
As a lowercase letter.
Cystic fibrosis is caused by a recessive allele. How many faulty alleles must an individual with cystic fibrosis have inherited from their parents?
One - either from the father or from the mother.
Two - one from the father and one from the mother.
Two - both from the father.
You only need one copy of the faulty allele to have Huntington's disease. This means that the allele is: