NEW
Font size
WorksheetsInheritance & Variation Championship
Total questions: 20
Worksheet time: 11mins
What are alleles?
Long strands of DNA that contain lots of genes.
Different versions of a gene.
The basic unit of heredity; controls a specific trait.
A characteristic passed from parent to offspring
The differences that occur from a mixture of genes
What is a gene?
Long strands of DNA that contain lots of genes.
Different versions of a gene.
The basic unit of heredity; controls a specific trait.
A characteristic passed from parent to offspring
The differences that occur from a mixture of genes
Why do human siblings look similar, but not always identical if they have the same parents?
The reason that siblings can look similar without being identical is that there is always a mutation in the chromosomes.
The reason that siblings can look similar without being identical is that they have the exact same DNA, but it is in a different order.
The reason that siblings can look similar without being identical is that there are multiple combinations of alleles that code for genes, that express as traits that can be inherited.
In dogs, the allele for black fur (B) is dominant over the allele for white fur (b). A breeder breeds a heterozygous dog with a recessive homozygous dog. If the female dog has a litter of 12 puppies, predict how many will have black fur.
12
3
6
4
In cats, the allele for stripes (S) is dominant over the allele for no stripes (s). Two heterozygous cats are bred. If the female cat has a litter of 8, predict how many kittens will have no stripes.
2
6
4
8
Which of the following are genetically inherited human characteristics that are not affected by any changes in the environmental conditions?
I Skin colour
II Blood group
III Presence of a dimple
IV Height
I and II
I and III
II and III
III and IV
The mutated DNA segment is TTACGCAAC. This is an example of ___ mutation.
?
Non-disjunction involving the X chromosomes occurs during oogenesis and produces two kinds of eggs, XX and O (no X chromosomes). If normal sperms fertilize the two types of eggs, which are the possible genotypes produced?
XX AND XY
XYY AND XO
XXY AND XO
YY AND XO
Cri du Chat syndrome is due to
deletion at chromosome 9
deletion at chromosome 5
inversion at chromosome 2
duplication at chromosome 3
Generally speaking, males have an XY chromosome, and females have an XX chromosome. However, not everyone is born this way.
What is it called when someone has an XXY chromosomes?
down syndrome
Klinefelter syndrome
Archaeopteryx
dinosaurs
