The family tree shows the inheritance of a recessive condition. Which of the following statements is/are correct?1 Individuals 1 and 2 are both heterozygous for this condition.2 Individuals 3 and…
The diagram shows part of a DNA double helix being copied Which of the following statements, considered independently, is/are correct?1 The probability of any base in strand 2 being guanine…
A student carried out tests to find out which molecules were present in a sample of urine from a human male. The student recorded the presence of large protein molecules…
In a type of fruit fly the brown body colour allele is dominant to the black body colour allele. A male fruit fly heterozygous for body colour and a female…
The picture shows a Siamese cat. This type of cat has a gene which is sensitive to temperature. When this gene is inactive in the cells, the coat colour is…
An experiment was carried out to investigate a gene for coat colour in mice. The diagram shows the results of three crosses between different mice, producing three different families, P,…
The sex of a species of fruit fly is determined by the number of X chromosomes relative to the number of non-sex chromosomes (A) in a cell. This is called…
A woman has a recessive genetic condition but neither of her parents has the condition.Which one of the following could not be true? Answer: In order to have the condition,…
Manx cats with two recessive alleles have a tail. Heterozygous Manx cats lack a tail. Individuals with both dominant alleles die before birth. Which answer shows the percentage of Manx…
What is the minimum number of people shown in the family pedigree who must be heterozygous for the two situations described in the table in the absence of any new…