Download Genetic Inheritance Test

Student Name: ________________________________
Genetics/Inheritance
Q1
What is a gamete? ____________________________________________________________________
What is its function? ___________________________________________________________________
Q2
Describe briefly what is meant by each of the following terms:
Allele
2(1) marks
__________________________________________________________________________
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 ______________________________________________________________
3(2) marks
Q4
Fill in the blanks in the cross shown to explain how it is equally likely to have a male or female child.
8(2) marks
Q5
State the Law of Segregation
____________________________________________________________________________________
____________________________________________________________________________________
State the Law of Independent Assortment
____________________________________________________________________________________
____________________________________________________________________________________
2(2) marks
Student Name: ________________________________
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) _________________________________________
3(2) marks
Q7
Explain what is meant by the following terms:
(a)
Locus _______________________________________________________________________________
(b)
Linkage _____________________________________________________________________________
(c)
Sex Linkage __________________________________________________________________________
3(2) marks
Q8
Determine the four possible F1 generation genotypes in a cross between a haemophiliac (n) male and a
heterozygous normal (N) female.
`
1 ______________________________
3 ______________________________
2 ______________________________
4 ______________________________
State the phenotypes of these individuals
`
1 ______________________________
3 ______________________________
2 ______________________________
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