HEREDITY AND VARIATIONS - Jamb Biology Past Questions and Answers

Question 56:

• JAMB 1999

Which of the following is one of Lamarck's theories?

A. Some variations are more favourable to existence in a given environment than others
B. All living organisms are constantly involved in a struggle to existence
C. The size of a given population remains fairly constant
D. New species originates through the inheritance of acquired traits

Question 57:

• JAMB 2000

A cross between an albino female and a genetically normal male will result in offspring that are

A. All albino
B. All phenotypically normal
C. All genetically normal
D. Half albino and half normal

Question 58:

• JAMB 2000

Blood grouping in human beings is derived from combinations of

A. Two different alleles
B. Four different alleles
C. Three different alleles
D. Two different genes

Question 59:

• JAMB 2001

Both recessive and dominant characters are found

A. On different chromosomes in the cell
B. At the same locus of a homologous chromosome
C. At different loci of a homologous chromosome
D. On the same chromatid in a chromosome

Question 60:

• JAMB 2001

A tall plants crossed with a dwarf one produces offspring of which half are tall and half are dwarf. What are the genotypes of the parents?

A. TT, TT
B. Tt, tt
C. TT, tt
D. Tt, Tt