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WorksheetsDA genetics
Total questions: 20
Worksheet time: 11mins
Cystic fibrosis is caused by having two copies of a recessive allele (ff). A carrier of cystic fibrosis has the genotype Ff. A person with the genotype FF is neither a carrier nor a sufferer.
The genotype of a carrier would be described as:
Homozygous recessive
Heterozyogous
Homozygous dominant
Heterozygous recessive
Cystic fibrosis is caused by having two copies of a recessive allele (ff). A carrier of cystic fibrosis has the genotype Ff. A person with the genotype FF is neither a carrier nor a sufferer.
What are the possible genotypes of children born to two carriers?
FF & ff
FF & Ff
Ff & ff
FF, Ff & ff
A person with cystic fibrosis has a gene mutation. This means
They have a missing gene
They have an extra chromosome
The amino acid sequence of their DNA is incorrect
The base sequence of their DNA is incorrect
A white flower has the genotype GG and a pink flower has the genotype gg.
Select ALL possible parents of a heterozygous plant
GG and GG
gg and gg
Gg and Gg
GG and gg
A human has 46 chromosomes in their skin cell nucleus. If they are male then they have
46 matching pairs
22 matching pairs
23 matching pairs
Two X chromosomes
Which phrase best describes a heterozygous genotype?
There are two dominant alleles
The individual will display the dominant phenotype
The individual will display the recessive phenotype
There are two recessive alleles
The gene for freckles has two forms. One form will cause the individual to have freckles and the other form will prevent freckles being visible. Different forms of a gene are called (a) .
Which is the correct Punnett square to show a cross between a homozygous dominant parent and a heterozygous parent?
A man with Huntington's disease has the genotype Hh. His sperm cells will contain
Only H alleles
Only h alleles
Either H or h alleles
Neither H nor h alleles
Which statement is FALSE ?
A human male has an X and Y chromosome
A human male has an X and X chromosome
A human female has an X and X chromosome
A human female has no
Y chromosomes
The photograph shows the chromosomes from a person who has 47 chromosomes. Choose the correct statement.
This is a female who has Down Syndrome
This is a female who does not have Down Syndrome
This is a male who has Down Syndrome
This is a male who does not have Down Syndrome
A mutation in fruit flies causes them to have small non functioning wings called vestigial wings. A normal fly is either NN or Nn, but a vestigial wing fly is nn.
What would you cross a normal winged fly with to determine its genotype?
NN
nn
nn or Nn
NN or nn
A heterozygous wild type male (Nn) is crossed with a heteozygous wild type female (Nn). If they produce 200 offspring, how many of them should be wild type
200
150
100
50
A section of DNA which carries the code for the production of a protein is called a (a) .
In the technique of amniocentesis
the mother's blood is tested for genetic disorders
the baby's blood is tested for genetic disorders
the fluid around the baby is tested for genetic disorders
the baby's cells are tested for genetic disorders
Which statement best describes a dominant allele?
An allele which affects phenotype when there is at least one copy
An allele which affects phenotype only when there are two copies
An allele which is masked by a recessive allele
An allele which is never passed on to offspring
Yellow alleles are dominant over orange. A pure breeding orange flowered plant is bred with a pure breeding yellow plant, so
all offspring will be yellow
offspring will be yellow or orange in a 2:1 ratio of orange to yellow
all offspring will be orange
offspring will be yellow or orange in a 3:1 ratio of orange to yellow
In pigs, short hair (H) is dominant over long hair (h). If a heterozygous pig is crossed with a long haired pig then
All the offspring will have short hair
The expected offspring ratio of short haired to long haired is 3:1
The expected offspring ratio of short haired to long haired is 2:1
The expected offspring ratio of short haired to long haired is 1:1
When a gene is mutated, what changes in the DNA?
The sugar-phosphate backbone
The amino acids
The order of the bases
The shape of the protein
There are two forms of the Scops Owl. The grey form is dominant, but the tan form has a homozygous recessive genotype. The pair shown here had 4 chicks, 3 were tan and 1 was grey. We can conclude that:
The grey parent was homozygous
Some of the chicks died before hatching
The grey parent was heterozygous
The tan parent was the female
