Q1 What is a gamete? ____________________________________________________________________
What is its function? ___________________________________________________________________
Q2 Describe briefly what is meant by each of the following terms:
Allele
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__________________________________________________________________________
Dominant __________________________________________________________________________
Recessive __________________________________________________________________________
Genotype __________________________________________________________________________
Phenotype __________________________________________________________________________
Homozygous _________________________________________________________________________
Heterozygous ________________________________________________________________________
Incomplete dominance _________________________________________________________________
8(2) marks
Q3 Write down the resulting ratio you would expect in each of the following monohybrid crosses:
(a) Two homozygous recessive parents _______________________________________________________
(b) One homozygous recessive parent and one heterozygous parent _______________________________
(c) Two heterozygous parents ______________________________________________________________
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Q4 Fill in the blanks in the cross shown to explain how it is equally likely to have a male or female child.
Q5 State the Law of Segregation
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____________________________________________________________________________________
____________________________________________________________________________________
State the Law of Independent Assortment
____________________________________________________________________________________
____________________________________________________________________________________
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Q6 Write down the resulting ratio you would expect in each of the following di-hybrid crosses. No linkage is involved.
(a) Two parents homozygous recessive for both characteristics ___________________________________
(b) One homozygous recessive parent and one heterozygous parent (for both characteristics) __________
(c) Two heterozygous parents (for both characteristics) _________________________________________
Q7 Explain what is meant by the following terms:
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(a) Locus _______________________________________________________________________________
(b) Linkage _____________________________________________________________________________
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(c) Sex Linkage __________________________________________________________________________
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Q8 Determine the four possible F1 generation genotypes in a cross between a haemophiliac (n) male and a heterozygous normal (N) female.
1 ______________________________
2 ______________________________
3 ______________________________
4 ______________________________
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State the phenotypes of these individuals
1 ______________________________
2 ______________________________
3 ______________________________
4 ______________________________
8(2) marks
Q9 The allele for tongue rolling (R) is dominant to the allele for non tongue rolling (r). Also the allele for brown hair (B) is dominant to red hair (b). Neither of these characteristics is sex linked.
Using the punnet square shown determine the possible F1 generation genotypes of a cross between two heterozygous parents (heterozygous for both characteristics).
28(1) marks