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WorksheetsGENES Y CROMOSOMAS
Total questions: 7
Worksheet time: 14mins
A two-cell sea urchin (Echinoidea) embryo was physically separated by scientists into two cells. Each cell, through further embryonic development, became an adult sea urchin.
What is the relationship between the two adult sea urchins?
They are equivalent to non-identical twins.
Half of the genes would be the same.
Both adults would have haploid cells.
They are clones.
The electron micrograph shows a section through a plant cell.
In which structure(s) is the genome of the cell contained?
Z only
X, Y and Z only
W and X only
X and Y only
What feature of eukaryotic chromosomes distinguishes them from the chromosomes of prokaryotes?
Histone proteins
Circular DNA
Double-stranded DNA molecules
Multiple genes along the length of each chromosome
What is a feature of the human genome?
Plasmids
Messenger RNA
Transfer RNA
Mitochondrial DNA
A pregnant woman had fetal cells removed by chorionic villus sampling and tested. The following karyogram was produced.
What does this show?
The child is female with Down syndrome.
The child is female without Down syndrome.
The child is male with Down syndrome.
The child is male without Down syndrome.
The system of sex determination in chimpanzees (Pan troglodytes) is the same as in other mammals. A chimpanzee has 48 chromosomes in the nuclei of its body cells.
What can be deduced from this information?
The sex of the chimpanzee
The number of genes in each chromosome
Whether non-disjunction has occurred
The number of autosomes in a diploid cell
Which statements are characteristics of alleles?
I. Alleles differ significantly in number of base pairs.
II. Alleles are specific forms of a gene.
III. New alleles are formed by mutation.
I and II only
I and III only
II and III only
I, II and III
