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WorksheetsIntroduction to Genetics
Total questions: 25
Worksheet time: 13mins
DNA is a nucleic acid
True
False
Chromosomes are part of genes.
True
False
Proteins are a code for making DNA.
True
False
DNA is a single helix.
True
False
Human beings have 23 genes.
True
False
Human egg cells have 23 chromosomes.
True
False
Tick all of the features of mitosis.
2 daughter cells produced
Daughter cells are non-identical
Daughter cells have 23 pairs of chromosomes
A skin cell is produced this way
Tick all the features of meiosis.
Produces diploid daughter cells
Produces gametes
4 daughter cells produced
Daughter cells have 23 chromosomes
Why is mitosis important? Tick all that apply.
Growth (increasing cell number)
Repairing damaged tissues
Asexual reproduction
Producing gametes
What is inheritance?
Offspring receive large sums of money from rich relatives.
Each parent's entire genome (all of their DNA) is passed on to offspring during reproduction.
Genes are passed from parent(s) to offspring in chromosomes during reproduction. 50% of the chromosomes are maternal and 50% are paternal.
Why is meiosis important?
Produces genetically identical gametes which produce genetically identical offspring. Genetic stability increases species' chances of survival.
Produced genetically different offspring for no reason at all!
Produces genetically different gametes which produce genetically diverse offspring. Genetic variation increases species' chances of survival.
What are alleles?
Positive or negative versions of a gene.
Large or small versions of a gene.
Dominant or recessive versions of a gene.
Red or blue versions of a gene.
Which of the following genotypes is/are homozygous?
Aa
AA
aa
Which of the following genotypes is/are heterozygous?
Aa
AA
aa
Which of the following genotypes is/are homozygous recessive?
Aa
AA
aa
Which of the following genotypes is/are homozygous dominant?
Aa
AA
aa
The cysitc fibrosis gene is represented by the letter C/c. Look at the pedigree diagram attached. How many of the offspring are carriers of cystic fibrosis?
1
2
3
4
A parent with cystic fibrosis is homozygous recessive (cc). If they have a child with someone that is homozygous dominant (CC), what is the probability their child will have cystic fibrosis?
0%
25%
50%
75%
100%
A parent with cystic fibrosis is homozygous recessive (cc). If they have a child with someone that is homozygous dominant (CC), what is the probability their child will carry the cystic fibrosis gene?
0%
25%
50%
75%
100%
What is the difference between a dominant and recessive allele?
Dominant alleles are better than recessive alleles
All recessive alleles cause diseases
Dominant alleles are all beneficial for survival
Dominant alleles mask the effect of recessive alleles
What are the organic bases in DNA?
Adenine, Guanine, Thymine, Uracil
Adenine, Guanine, Thymine, Cytosine
Adenine, Guanine, Uracil, Cytosine
Adenine, Glutamic acid, Thymine, Cytosine
One gene codes for...
One polypeptide chain
One protein
One amino acid
One carbohydrate
