GCSE Biology – Genetic crosses
Learning Objectives
-I can explain how characteristics can be controlled by genes
-I can predict the results of a genetic cross by completing a Punnett square diagram
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Question 1 of 28
1. Question
What is phenotype?
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Question 2 of 28
2. Question
How many pairs of chromosomes do human cells contain?
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Question 3 of 28
3. Question
How are sex chromosomes determined?
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Question 4 of 28
4. Question
What are the two sex chromosomes?
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Question 5 of 28
5. Question
Which sex chromosome is the larger one?
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Question 6 of 28
6. Question
Which sex chromosome is the smaller one?
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Question 7 of 28
7. Question
What do females have as their sex chromosomes?
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Question 8 of 28
8. Question
What do males have as their sex chromosomes?
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Question 9 of 28
9. Question
Where do baby boys inherit their Y chromosome from?
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Question 10 of 28
10. Question
Where do baby boys inherit their Y chromosome from?
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Question 11 of 28
11. Question
What does homozygous mean?
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Question 12 of 28
12. Question
What does heterozygous mean?
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Question 13 of 28
13. Question
What does homologous chromosomes mean?
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Question 14 of 28
14. Question
How many of our chromosome pairs are homologous?
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Question 15 of 28
15. Question
What is a dominant allele?
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Question 16 of 28
16. Question
What is a recessive allele?
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Question 17 of 28
17. Question
What do we give the dominant gene in a gene pair?
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Question 18 of 28
18. Question
What do we give the recessive gene in a gene pair?
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Question 19 of 28
19. Question
Describe the gene pair Hh.
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Question 20 of 28
20. Question
Describe the gene pair dd.
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Question 21 of 28
21. Question
Describe the gene pair AA.
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Question 22 of 28
22. Question
Which pair is not homologous?
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Question 23 of 28
23. Question
What is a Punnett square?
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Question 24 of 28
24. Question
If two parents are heterozygous for a gene, what is the probability of the offspring having homozygous dominant genes?
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Question 25 of 28
25. Question
If two parents are heterozygous for a gene, what is the probability of the offspring having heterozygous genes?
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Question 26 of 28
26. Question
If two parents are homozygous dominant for a gene, what is the probability of the offspring having heterozygous genes?
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Question 27 of 28
27. Question
If there is XX alleles from the mother and XY alleles from the father, what is the likelihood of having a boy?
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Question 28 of 28
28. Question
If there is XX alleles from the mother and XY alleles from the father, what is the likelihood of having a girl?
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