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Question 1 of 20
1. Question1 point(s)
What are correct descriptions of mitosis and meiosis?
mitosis meiosis A cells produced are genetically identical repairs damaged cells B halves the chromosome number cells produced are genetically identical C involved in asexual reproduction halves the chromosome number D involved in sexual reproduction doubles the chromosome numberCorrectIncorrect
Question 2 of 20
2. Question1 point(s)
A man has three sons.
What is the chance of his next child being a son?CorrectIncorrect
Question 3 of 20
3. Question1 point(s)
The diagram shows a cross between heterozygous tall pea plants.
Which statement is not correct?CorrectIncorrect
Question 4 of 20
4. Question1 point(s)
The bar chart shows the heights of pea plants grown from 500 pea seeds.
What variation do the plants show?CorrectIncorrect
Question 5 of 20
5. Question1 point(s)
In the inheritance of ABO blood groups, when two parents have the genotypes IAIA and IAIo, what is the blood group of their offspring?CorrectIncorrect
Question 6 of 20
6. Question1 point(s)
Which structure will be found in the nucleus of a body cell in a woman?CorrectIncorrect
Question 7 of 20
7. Question1 point(s)
When a cell divides, these events occur.
- The DNA inside the cell is duplicated exactly.
- Daughter cells are produced with the same chromosome number as the parent cell.
Which type of division has occurred?CorrectIncorrect
Question 8 of 20
8. Question1 point(s)
Dianthus flowers can be one of three different colours: red, pink or white.
A red flower is always homozygous and a white flower is always homozygous. Pink flowers are heterozygous.
If a red and a white flower are crossed, what percentage of the offspring will be pink?CorrectIncorrect
Question 9 of 20
9. Question1 point(s)
An alligator has 32 chromosomes in each of the cells of its nose.
How many chromosomes will an alligator zygote contain?CorrectIncorrect
Question 10 of 20
10. Question1 point(s)
What are stem cells?CorrectIncorrect
Question 11 of 20
11. Question1 point(s)
The list shows the diploid number of chromosomes of four organisms.
- fruit fly 8
- human 46
- potato 48
- garden pea 14
What is the correct chromosome number of a male sex cell in each of these organisms?
fruit fly human potato garden pea A 4 23 24 7 B 4 46 12 7 C 8 46 48 14 D 16 92 96 28CorrectIncorrect
Question 12 of 20
12. Question1 point(s)
Which row correctly shows whether the nuclei of the cells are diploid or haploid?
body cells gametes zygote A diploid diploid haploid B diploid haploid diploid C haploid diploid haploid D haploid haploid diploidCorrectIncorrect
Question 13 of 20
13. Question1 point(s)
Cell division by meiosis of a parent cell with 23 pairs of chromosomes will result inCorrectIncorrect
Question 14 of 20
14. Question1 point(s)
Colour blindness is a condition that occurs more frequently in men than in women.
Which statement about this condition is correct?CorrectIncorrect
Question 15 of 20
15. Question1 point(s)
Four of the processes involved in the production of a protein are shown.
- mRNA attaches to a ribosome.
- mRNA moves to the cytoplasm.
- The ribosome assembles amino acids into a protein molecule.
- An mRNA copy of the gene is made.
In which sequence do these events normally occur?CorrectIncorrect
Question 16 of 20
16. Question1 point(s)
Which statement about the sex chromosomes is correct?CorrectIncorrect
Question 17 of 20
17. Question1 point(s)
The diagram shows the chromosomes in the nucleus of a body cell in an adult fruit fly.
What are the diploid and haploid number of chromosomes in the fruit fly?
diploid haploid A 4 8 B 8 4 C 8 16 D 16 8CorrectIncorrect
Question 18 of 20
18. Question1 point(s)
The diagram shows the phenotypes for blood groups in a family.
Which statement about the genotypes of the parents is correct?CorrectIncorrect
Question 19 of 20
19. Question1 point(s)
Sickle-cell anaemia is a genetic disorder which results in severe illness in homozygous individuals. In some human populations being heterozygous can be beneficial.
What could be the reason for this?CorrectIncorrect
Question 20 of 20
20. Question1 point(s)
The mitotic index of a tissue is the percentage of cells in a tissue that are undergoing division.
The table shows the number of cells in two tissue samples, X and Y.
number of cells
number of cells
total number of
cells in the
X 25 55 80 Y 15 95 110
Which statement is correct?CorrectIncorrect