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WorksheetsInheritance, Selective breeding
Total questions: 20
Worksheet time: 59mins
1. The nucleus in each cell in the stem of a plant contains 32 chromosomes. How many chromosomes are there in the nuclei of its pollen grains?
A. 8
B. 16
C. 32
D. 64
2. In a certain plant, the allele for white fruit, W, is dominant over the allele for yellow fruit, w. A white-fruited plant was crossed with a yellow-fruited plant. About half of the offspring were white-fruited and the other half were yellow-fruited. Which genotypes did the parent plants have?
A. ww and ww
B. Ww and ww
C. WW and ww
D. WW and Ww
3. A family has three daughters. The mother is pregnant for the fourth time. What is the chance of the fourth child being a son?
A. 25%
B. 50%
C. 75%
D. 100%
4. Night-blindness is an inherited condition, caused by a dominant allele. The chart shows how this condition was passed on in one family.
Person X marries someone with normal sight.
What is the chance that their first child will have night-blindness?
A. 0%
B. 50%
C. 75%
D. 100%
5. Why does meiosis occur during the formation of gametes?
A. It allows the number of gametes to be doubled.
B.It prevents asexual reproduction occurring in the life cycle.
C. It prevents variations appearing in the phenotype.
D.It produces haploid gametes in preparation for fertilisation.
6. A dominant allele ......................
A. causes only harmful characteristics
B.is responsible for male characteristics
C. never undergoes mutation
D. produces the same phenotype in heterozygotes and homozygotes
7. Which statement describes human cells formed by meiosis?
A. They are genetically identical and they become gametes.
B.They are genetically identical and they become tissues.
C. They are not genetically identical and they become gametes.
D. They are not genetically identical and they become tissues.
8. Which blood group genotype is homozygous dominant?
A. IA IO
B. IA IB
C. IB IB
D. IO IO
9. Which statement describes an example of artificial selection?
A. It has been found that some strains of bacteria produce antibiotics.
B. It is common practice to mate bulls with cows that produce the most milk.
C. It is possible to control caterpillars on food crops by releasing small wasps which lay their eggs in caterpillars and kill them.
D. Mosquitoes have developed strains that are resistant to insecticides.
10. Farmers crossed two breeds of cattle, the Jersey from Europe and the Sahiwal from Africa. For many generations, the farmers picked out the offspring with the highest milk yields to breed the next generation.
Which phrase best describes this process?
A. artificial selection
B. discontinuous variation
C. evolution
D. natural selection
11. Which of these may be heterozygous?
A. a cell which is haploid
B. an allele of a gene
C. an organism with a dominant phenotype
D. an organism with a recessive genotype
12. What causes sickle cell anaemia?
A. a change in the structure of a gene
B. an iron-deficient diet
C. infection following a bite from a mosquito
D. loss of blood following an accident
13. What is a result of natural selection?
A. cattle that produce large quantities of milk
B. crop plants that are resistant to disease
C. grapes that develop no seeds
D. mosquitoes that are resistant to insecticides
14. Which statement about human blood groups is correct?
A. A person with the blood group A cannot have an IO allele.
B. A person with the blood group B may have either the genotype IBIB or IBIO.
C. In a person with blood group AB, the IB allele is recessive to the allele IA.
D. The alleles IO and IB are co-dominant and have equal effect on a phenotype.
15. In a large family, half the children were blood group A and half were blood group B.
If the father was blood group O, what was the mother’s blood group?
A. A
B. B
C. AB
D.O
16. How many chromosomes are there in a zygote which develops into a baby with Down’s syndrome?
A. 23
B. 24
C. 46
D.47
17. What determines the sex of a child?
A. chromosome content of the ovum
B. chromosome content of the sperm
C.number of days between ovulation and fertilisation
D. number of days between fertilisation and implantation
18. What is one of the processes involved in selective breeding?
A. Choosing individuals from different species to breed together
B. Letting individuals reproduce without interference
C. Choosing individuals with desirable features
D. None of the above
19. Which of these is a common example of selective breeding?
A. Cows that produce lots of meat
B. Tomato plants that produce fewer tomatoes
C. Crops that catch diseases
D. None of the above
20. A gardener takes pollen from one orchid flower and uses it to pollinate a flower on another orchid plant. What method is this a part of?
A. Selective breeding
B. Genetic modification
C. Natural selection
D. None of the above
