Download Cloze passage 3

The Blueprint of Life
CLOZE PASSAGE No 3
DNA and Chromosomes
Complete the following sentences using appropriate words or short phrases
a)
The name of 2 biologists that provided the basis for the modern view of the relationship
between genes and chromosomes in inheritance.
b) Chromosomes are composed of strands of a chemical substance called
c) The complementary base to guanine
d) The swapping of genes by the inside chromatids during meiosis is called
f) A recessive gene carried on the X chromosome is said to be …………… linked
g) Neither gene is dominant and both alleles are expressed
h) The genotype for roan cattle
i)
The name or letter of the short male chromosome.
j)
A female with genotype XRXr is said to be a …………………….
k) A graphic representation of the chromosomes of an organism is called a ……………
l)
Genes that occur on the same chromosome are said to be ……………………
m) Hydranges grown in acidic soil are usually coloured
n) The building blocks for DNA are called ………………….
o) The twisted shape of a DNA molecule
p) A biologist who worked with fruit fly to identify sex-linkage
q) The features or traits of an organism are controlled by both genes and the …………….
r) The base complementary to thymine
s) A model we used to represent chromosomes
t) A biological name for a family tree
u) A colourblind male need only ……….. recessive gene to be colourblind
v) The name of the 5 carbon sugar found in DNA
w) A person with 3 number 21 chromosomes will suffer from ……………..syndrome
x) A person with genotype IA i will have blood group
y) The production of gametes is achieved by a process called ………………..
z) A nucleotide is composed of a 5 carbon sugar, a base and a …………………. group