Summative Practice Chapter 11 – Question 2 (Form 5 Biology Textbook Exercise and Answer)

Question 2:A man has normal eyesight whereas his wife is colour blind. XB is a dominant allele for normal eyesight whereas Xb is a recessive allele for colour blindness. What is the probability of their children having:(a) Colour blindness?(b) Normal eyesight but a carrier?Explain your answers using a schematic diagram. Answer:Schematic diagram for colour blindness … Read more

Summative Practice Chapter 11 – Question 1 (Form 5 Biology Textbook Exercise and Answer)

Question 1:Figure 1 shows a cross between two pea plants, X and Y. If:(a) State the phenotypes of parental plants X and Y.(b) Complete the gamete genotypes produced by each parent, and phenotypes in F1 generation in Figure 1.(c) Table 1 shows the genotypes of F2¬†generation after F1 was crossed with another F1 generation. The … Read more

Formative Practice 11.3 (Form 5 Biology Textbook Exercise and Answer)

Question 1:State the meaning of:(a) locus(b) allele Answer:(a) Locus: Specific location of a gene in a chromosome.(b) Allele: An alternative form of a gene for a specific trait that is located on the same locus of a pair of homologous chromosome. Question 2:Based on the figure below, explain the relationship between locus, gene and allele. … Read more

Formative Practice 11.2 (Form 5 Biology Textbook Exercise and Answer)

Question 1:Mendel performed cross between pea plants to study two characteristics, namely flower position and flower colour. Which type of inheritance is this? Answer:Dihybrid inheritance Question 2:The following table shows dihybrid cross between two pea plants.Which F1 generation phenotypes are probably produced? Answer:Round and yellow pod, round and green pod, constricted and yellow pod, constricted … Read more

Formative Practice 11.1 (Form 5 Biology Textbook Exercise and Answer)

Question 1:What is meant by purebreed? Answer:Purebreed means that the organism genotype is homozygous; whether it is homozygous dominant or homozygous recessive. The organism carries two similar alleles for each characteristic. Question 2:In a fertilisation between two rats, B represents dominant allele for black fur, whereas b represents recessive allele for white fur. If the … Read more