Question

a bivalent cannot have a) four chromatids b) homologous chromosomes c) two centrosomes d) only two telomeres​

Answer 1

d) only two telomeres is right.

Answer 2

A bivalent cannot have d) Only two telomeres.

Bivalent

• Homologous recombination of DNA forms a tetrad of chromatids. A single pair of chromosomes in a tetrad is called a bivalent chromosome.
• The repetitive DNA sequence near the ends of a chromosome is called a telomere. Telomeres defend the chromosome from degradation.
• In order to protect the bivalent from enzymatic digestion following the zygotene stage, it contains 8 telomere caps.

Incorrect options

• Bivalents are pairs of chromosomes made up of four chromatin fibres, thus option a) Four chromatids is a correct option.
• b)Homologous chromosomes result from homologous recombination.
• c) It contains two centrosomes.

Thus, a bivalent cannot have d) Only two telomeres.