Antibiotic resistance gene meaning

Antibiotic resistance gene meaning Antibiotics are the medications that kill bacteria. Anti means ‘against’ and biotic means ‘life’. Antibiotic resistance gene meaning: It has the ability to resist the effects of antibiotics. This gene is present in plasmid of bacteria. R plasmid are bacterial resistant plasmid that carry genes to provide resistance against the antibiotic. […]

Number of chromosomes

Number of chromosomes Arabidopsis plants have 10 chromosomes (5 pairs) in their somatic cells. How many chromosomes are present in each of the following: (a) egg cell nucleus in the female gametophyte, (b) generative cell nucleus in a pollen grain, (c) fertilized endosperm nucleus, (d) fertilized egg nucleus? (a) Egg cells are haploid. Sperm and […]

Chromosome of a prokaryote is larger than some of the chromosomes of a eukaryote

Chromosome of a prokaryote is larger than some of the chromosomes of a eukaryote A cell of the bacterium E. Coli, a prokaryote contains one chromosome with about 4.6 million base pairs of DNA comprising 4288 protein-encoding genes. A cell of the yeast saccharomyces cerevisiae eukaryote, contains about 12 million base pairs of DNA comprising […]

Are the synergid cells in an Arabidopsis female gametophyte genetically identical to the egg cell nestled between them.

Answer: Yes, synergid cells in an Arabidopsis female gametophyte genetically identical to the egg cell nestled between them. Explanation: Synergid cells in the female gametophyte are positioned adjacent to the egg cell and plays an important role in guiding pollen tube and fertilization. The Arabidopsis thaliana is a small flowering plant which is used as […]

In Arabidopsis, is leaf tissue haploid or diploid? How many nuclei are present in the female gametophyte?

Answer: In Arabidopsis, leaf tissue is diploid. Eight nuclei are present in the female gametophyte. Three nuclei are present in the male gametophyte. Explanation: The Arabidopsis thaliana is a small flowering plant which is used as a model organism. Flowers are the reproductive organs. Male and female gametes are produced through meiosis Microspores are produced […]

During meiosis, when does chromosome disjunction occur? When does chromatid disjunction occur?

Answer: Chromosome disjunction occurs during anaphase of meiosis I and chromatid disjunction occurs during anaphase of meiosis II. Explanation: Disjunction is defined as separation of sister chromatids or homologous chromosomes during cell division. Gametes are eggs and sperm cells having one set of 23 chromosomes. This is called as haploid or n gametes and fusion […]