GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
a nucleus containing two sets of chromosomes
|
|
|
a nucleus containing two unpaired chromosomes
|
|
|
a nucleus with two alternative forms of a gene
|
|
|
a nucleus with two separate threads of DNA
|
Detailed explanation-1: -Diploid is a term that refers to the presence of two complete sets of chromosomes in an organism’s cells, with each parent contributing a chromosome to each pair. Humans are diploid, and most of the body’s cells contain 23 chromosomes pairs.
Detailed explanation-2: -Definition. A cell containing two copies of each chromosome is referred to as a ‘diploid cell’; human somatic cells are diploid: they contain 46 chromosomes, 22 pairs of autosomes and a pair of sex chromosomes.
Detailed explanation-3: -A diploid cell contains two complete sets of chromosomes in its nucleus, whereas haploid cells only contain a single copy. Most human body cells are diploid, and only the gametes (sperm and egg cells) are haploid. Chromosomes in diploid cells are arranged in homologous pairs.
Detailed explanation-4: -Meiosis begins with a parent cell that is diploid, meaning it has two copies of each chromosome. The parent cell undergoes one round of DNA replication followed by two separate cycles of nuclear division.