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Question 1 of 20
1. Question1 point(s)
A pure-breeding white rat was crossed with a pure-breeding black rat. All their offspring were black.
One of the offspring was bred with a pure-breeding white rat.
What is the most likely percentage of black rats in the offspring?CorrectIncorrect
Question 2 of 20
2. Question1 point(s)
An organism is heterozygous for a gene with the alleles T and t.
Which diagram represents a diploid cell from this organism?CorrectIncorrect
Question 3 of 20
3. Question1 point(s)
Red-green colour blindness is a sex-linked characteristic caused by a recessive allele.
Which prediction can be made about the children of a woman who is colour-blind and a man with normal vision?CorrectIncorrect
Question 4 of 20
4. Question1 point(s)
What is the role of mRNA?CorrectIncorrect
Question 5 of 20
5. Question1 point(s)
The diagram shows the formation of new diploid cells.
What do arrows X and Y represent?
X Y A duplication of chromosomes meiosis B duplication of chromosomes mitosis C meiosis duplication of chromosomes D mitosis duplication of chromosomesCorrectIncorrect
Question 6 of 20
6. Question1 point(s)
A man marries a woman who has a different blood group from him. They have two children. The children have different blood groups from each other and different blood groups from their parents.
What are the genotypes of the parent’s blood groups?CorrectIncorrect
Question 7 of 20
7. Question1 point(s)
Sickle-cell anaemia is a genetic disease that is caused by the allele HbS.
HbA is the normal allele.
A woman does not have the symptoms of the disease but her brother does show symptoms.
If her mother and father do not have symptoms, which statement is correct?CorrectIncorrect
Question 8 of 20
8. Question1 point(s)
A sperm cell from a domestic cat contains 19 chromosomes.
If this cell fertilises an egg, which zygote is produced?CorrectIncorrect
Question 9 of 20
9. Question1 point(s)
The diagram shows a cell of an organism. The nucleus contains 12 chromosomes.
After it divides by mitosis, how many chromosomes would be present in one of the daughter cells?CorrectIncorrect
Question 10 of 20
10. Question1 point(s)
Pure-breeding black-feathered chickens are mated with pure-breeding white-feathered chickens. All of the individuals in the offspring in the F1 generation have both black and white feathers.
What will be the ratio of offspring phenotypes when two of the F1 generation chickens are crossed?CorrectIncorrect
Question 11 of 20
11. Question1 point(s)
Which name is given to different versions of a gene?CorrectIncorrect
Question 12 of 20
12. Question1 point(s)
Which feature of meiosis ensures that the zygote is diploid?CorrectIncorrect
Question 13 of 20
13. Question1 point(s)
Which genotypes result in a person having blood group A?CorrectIncorrect
Question 14 of 20
14. Question1 point(s)
How many chromosomes are there in each of the human cells shown in the table?
goblet cell motor
sperm A 0 23 0 0 B 23 23 23 0 C 46 46 0 23 D 46 46 46 23CorrectIncorrect
Question 15 of 20
15. Question1 point(s)
The diagram shows a diploid cell and alleles R and r on one pair of chromosomes.
When this cell divides by mitosis, which daughter cells will be produced?
chromosome number genotype A diploid heterozygous B diploid homozygous C haploid heterozygous D haploid homozygousCorrectIncorrect
Question 16 of 20
16. Question1 point(s)
The diagram shows breeding rats where the allele for grey fur is dominant to white fur.
Which two individuals are definitely heterozygous for fur colour?CorrectIncorrect
Question 17 of 20
17. Question1 point(s)
The diagram shows a genetic cross between a male bird with black feathers and a female bird with white feathers. All of the offspring have blue feathers.
Two of the blue offspring are crossed.
Which row shows the correct phenotype percentages for the cross?
A 25 75 0 B 25 50 25 C 50 20 25 D 75 0 25CorrectIncorrect
Question 18 of 20
18. Question1 point(s)
A haploid nucleus is defined as one that containsCorrectIncorrect
Question 19 of 20
19. Question1 point(s)
Sickle-cell anaemia is caused by a mutation in the haemoglobin gene.
The normal base sequence is shown in 1, and the sickle-cell base sequence is shown in 2.
- TGA GGA CTC CTC
- TGA GGA CAC CTC
What causes the change in the DNA?CorrectIncorrect
Question 20 of 20
20. Question1 point(s)
In cats, the allele for short hair is dominant to the allele for long hair. A short-haired cat gives birth to five kittens. Two of them have long hair.
Which statement must be correct?CorrectIncorrect