Chromosomes

What does the karyotype below correspond to?

• A normal female

• A normal male

• A female with Down syndrome

• A male with Down syndrome

Which is a characteristic of the haploid number of eukaryotic chromosomes?

• It doubles in mitosis.

• It is fixed for each species.

• It is an even number for all species.

• It is positively correlated with an animal’s mass.

What is the same in all parts of homologous chromosomes?

• Base pair sequence

• Alleles

• Sequence of genes

• Deletions

What determines the genomic size of a species?

• The total amount of DNA

• The total number of genes

• The total number of alleles

• The total number of chromosomes

For what purpose is a karyogram used?

• To identify gene loci in a species

• To identify linked genes in the chromosomes of an individual

• To identify the genome size of a species

• To identify abnormal chromosomes in an individual

What distinguishes an allele from a gene

• An allele is made of RNA

• An allele is shorter

• An allele is a variety of a gene

• An allele cannot be transferred during genetic modification

What is characteristic of homologous chromosomes?

• They have an identical DNA sequence.

• They are of the same length in karyograms.

• They form pairs in prokaryotes.

• They carry the same alleles.

What causes the presence of three chromosomes 21 in Down syndrome?

• Crossing over

• Allele change

• Non-disjunction

• Gene mutation

The structure that holds two chromosomes together until they separate for cell division is the

• chromatid
• chromatin
• centromere
• cytoplasm

Which of these organisms has more chromosomes than humans?

• chimpanzees
• potatoes
• plums
• all of these -- the number of chromosomes does not determine complexity of the organism