Cause ,XYY is not inherited, but usually occurs as a random event during the formation of sperm cells.

The first sperm that penetrates fully into the egg donates its genetic material (DNA).

A person or persons that have the necessary components to reproduce, but may have a low sperm count or problems with ovulation could look into options such as artificial insemination or intracytoplasmic sperm injection(ICIS).

The females store the sperm they obtain during their nuptial flight to selectively fertilise future eggs.

Now, theoretically, they are able to make sperm and egg cells with old skin cells.

And I said, Well, Men, through their penis, they fertilize the eggs by the sperm coming out.

Contribution by farmers

Contribution by the scientific and technological community

Based on the contribution of Mr. M. Matheson.

Government involvement involvement of Government and partnerships

Other experts were urged to contribute.

Participation of women in higher education

communicate IAF's activities and outcomes to a wider range of constituencies within Major Groups enhance the contribution and participation of Major Groups.

Exports of cattle and semen were for a while an important economic resource for the island and in the early 20th century a large number of Guernsey cattle were exported to the United States.

It could fulfil its mandate only with the tangible support of all Member States.

Contribution of international organizations to the work of the Commission

This is a substantial contribution by women.

E. Contribution from a mandate holder

If one of these atypical sperm cells contributes to the genetic makeup of a child, the child will have an extra Y chromosome in each of the body's cells.

Takes note of the report of the Working Group (E CN.4 2005 89 and Add.1 and 2) and welcomes the continuation and positive nature of the deliberations of the Working Group, in particular the measures taken to ensure effective input by organizations of indigenous people

Contribution of international organizations to the work of the Commission.

Contribution of international organizations to the work of the Commission

Contributions from a United Nations agency

At the same time, the AU contribution to improving security in Darfur was limited by the size of its force and its level of operational capability.

Intracytoplasmic sperm injection is a more recent technique that involves injecting a single sperm directly into an egg, the egg is then placed in the uterus by in vitro fertilization.

According to an autosomal DNA genetic study conducted in 2008 by the University of Brasília (UNB), the composition of Venezuela's population is 60.60 of European contribution, 23 of indigenous contribution, and 16.30 of African contribution.

Early in embryonic development in females, one of the two X chromosomes is randomly and permanently inactivated in nearly all somatic cells (cells other than egg and sperm cells).

... Libya has historically made a limited contribution to Arabian literature .

Based on the contribution provided by Mr. D. Opertti Badan.

POSSIBLE CONTRIBUTION TO THE MILLENNIUM 5 SUMMIT

A contribution of 6,306 was subsequently received from Spain and an additional contribution of 1,500 was subsequently received from Kazakhstan.

The contribution by external experts has brought broader perspectives to our deliberations.

The National Commission of Togo has provided a significant contribution to this project.

No contribution was made to the fund in 2004.

Possible contribution to the 2005 World Summit

The child friendly community initiative had been a valuable contribution.

The UNICEF contribution towards harmonization was not well reflected in the document.

The Government of Timor Leste has decided to make a modest financial contribution.

The outcome of the Meeting2 has provided input for the present report.

The conference focused on examining the extent to which current disarmament, demobilization and reintegration programmes genuinely contribute to stability and identifying the necessary preconditions for the success of such programmes.

Normally a gamete (sperm or egg) carries a full set of chromosomes that includes a single copy of each chromosome, as aneuploidy generally leads to severe genetic disease in the offspring.

(i) In paragraph (b), after The contribution add and impact

But to take part in a school play is to contribute to a community good.

To unify the columns of revolutionaries, I would like us to agree on the following

He discussed the contribution of foreign companies to his country's economic and social development.