WorksheetsUnit 7. Review Grade 8TK
Total questions: 20
Worksheet time: 13mins
In most cells, there are .................. copies of each thread.
chromosomes
DNA
four
genes
two
Each thread contains many ..................................
chromosomes
DNA
four
genes
two
The threads are made of a chemical called .............................
chromosomes
DNA
four
genes
two
Also known as gametes
Egg cells
Sperm cells
This gamete can swim
Sperm cell
Egg cell
It contains either an X chromosome or a
Y chromosome
Egg cells
Sperm cells
What is an antibiotic?
The differences between the individuals in a species are called
Genes
Environment
Variation
Species
Variation is caused by genes and environment.
True
False
Genes provide a set of instruction that determine some of the characteristics of an organism.
True
False
Genes provide a set of instruction that determine some of the characteristics of an organism.
True
False
Offspring inherit 100% of their genes from each of their parents
True
False
When antibiotics are used, any bacteria that have a gene that makes them resistant to the antibiotic survive and reproduce. Natural selection causes populations of resistant bacteria to be produced.
TRUE
FALSE
Selective breeding is when people bread animals and plants, they can choose which ones they will allow to breed.
TRUE
FALSE
Which chromosomes pair determines the gender of the child?
Pair 22
Pair 1
Pair 10
Pair 23
In which part of the cell is DNA found?
Cytoplasm
Nucleus
Cell wall
Cell membrane
In your own words, explain what is meant when we say that bacteria have become "resistant" to an antibiotic.
Part of a chromosome that determines ones particular characteristic of an organism.
Genes
fertilisation
variation
The nucleus of every cell contains several long threads, called _________
chromosomes
DNA
four
genes
Two
The nucleus of every cell contains several long threads, called _______________
chromosomes
DNA
four
genes
two
