What is the significance of only one of the pair of chromosomes?

What is the significance of only one of the pairs of chromosomes ending its random journey facing up?

Only one of each chromosomal pair faces up. The upward facing one of the pair represents the chromosome that ended up in the successful germ cell that you have just produced. Yes, those 23 chromosomes that are all neatly lined up represent the contents your sperm or egg.

What is one chromosome in a pair called?

The 46 chromosomes of a human cell are organized into 23 pairs, and the two members of each pair are said to be homologues of one another (with the slight exception of the X and Y chromosomes; see below). Human sperm and eggs, which have only one homologous chromosome from each pair, are said to be haploid (1n).

What is it called when two genes are in a cell and one gene’s phenotype is expressed and one is not?

An organism which has two different alleles of the gene is called heterozygous. Phenotypes (the expressed characteristics) associated with a certain allele can sometimes be dominant or recessive, but often they are neither. … However, there are exceptions to the way heterozygotes express themselves in the phenotype.

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Can a human have 50 chromosomes?

These findings show that initial hyperdiploidy (greater than 50 chromosomes) is an independent favorable prognostic sign in childhood ALL and additional chromosomal structural abnormalities may not indicate a poor prognosis among childhood ALL with hyperdiploidy (greater than 50 chromosomes).

What happens when a baby is born missing a chromosome?

But if meiosis doesn’t happen normally, a baby may have an extra chromosome (trisomy), or have a missing chromosome (monosomy). These problems can cause pregnancy loss. Or they can cause health problems in a child. A woman age 35 years or older is at higher risk of having a baby with a chromosomal abnormality.

What is the main difference between Chromatin and chromosomes?

Chromatin is a complex formed by histones packaging the DNA double helix. Chromosomes are structures of proteins and nucleic acids found in the living cells and carry genetic material. Chromatin is composed of nucleosomes. Chromosomes are composed of condensed chromatin fibers.

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