Why do chromosomes look like?

Why are chromosomes shaped differently?

Chromosomes are smooth cylinders because this morphology has a lower surface energy than structures having irregular surfaces. The symmetry breaking produced by the different values of the surface energies in the telomeres and in the lateral surface explains the elongated structure of the chromosomes.

What is chromosome made up of?

A chromosome is made up of proteins and DNA organized into genes. Each cell normally contains 23 pairs of chromosomes.

What is the gender of YY?

Males with XYY syndrome have 47 chromosomes because of the extra Y chromosome. This condition is also sometimes called Jacob’s syndrome, XYY karyotype, or YY syndrome. According to the National Institutes of Health, XYY syndrome occurs in 1 out of every 1,000 boys.

What are the 23 human chromosomes?

Humans have 23 pairs of chromosomes–22 pairs of numbered chromosomes, called autosomes, and one pair of sex chromosomes, X and Y. Each parent contributes one chromosome to each pair so that offspring get half of their chromosomes from their mother and half from their father.

Can humans have 24 pairs of chromosomes?

In 1923 he published his results. Sperm contained 24 chromosomes, so if there were an equal number coming from the egg then humans must have 48 chromosomes in total, 24 pairs.

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Is DNA and chromosomes the same?

In the nucleus of each cell, the DNA molecule is packaged into thread-like structures called chromosomes. Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.

Can an XY female get pregnant?

Males and most XY females cannot become pregnant because they don’t have a uterus. The uterus is where the fetus develops, and pregnancy isn’t possible without it. In most cases, having a Y chromosome means having no uterus, so pregnancy isn’t possible.

CAN XXY have babies?

It is possible that an XXY male could get a woman pregnant naturally. Although sperm are found in more than 50% of men with KS3, low sperm production could make conception very difficult.

How many sexes are there?

Based on the sole criterion of production of reproductive cells, there are two and only two sexes: the female sex, capable of producing large gametes (ovules), and the male sex, which produces small gametes (spermatozoa).