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WorksheetsVariation and Classification
Total questions: 15
Worksheet time: 6mins
Organisms inherit (a) from their parents
The nucleus of every cell contain long thin thread like structures called
nucleoli
genes
chromosomes
Which of these pairs are both gametes?
Sperm and ovum
Ovum and zygote
Zygote and sperm
Which pair of sex chromosomes shows a human female?
YY
XY
XX
How many chromosomes do gametes have?
Half the number that are in body cells
The same number as are in body cells
Twice the number that are in body cells
How many chromosomes do humans have?
2
23
46
Which of the following is NOT true?
fertilisation is when the cytoplasm of the egg cell and sperm combine
non-identical twins grow from separately fertilised eggs
genetic information is stored in the cell nucleus
identical twins are formed from a fertilised egg that divides into two complete cells
What shape is DNA?
Double helix
X-shaped
Spherical
How many genes do we have?
23 pairs
23
Around 20,000
What is the definition of a gene?
One copy of all our DNA
A section of DNA that gives a characteristic
A coiled-up, x-shaped section of DNA
mendel's factors are now called
chromosomes
traits
genes
characteristics
The offspring formed when TT and Tt are crossed are
(a)
Sometimes mistakes are made when genes are copied. These are called (a)
Organisms in a species show (a) .
Mendel observed that there were (a) characteristics in a pea plant that were different. ( write the number)
