Q 01/05

Which term describes identical twins, as opposed to fraternal ones?

A) Dizygotic

B) Monozygotic

C) Heterozygous

D) Polyzygotic

Answer · why

B) Monozygotic

Monozygotic twins are the identical kind: one zygote (from Greek zygotos, 'yoked') splits into two embryos, while dizygotic twins each grow from a sep...

Q 02/05

Worldwide, roughly one delivery in how many produces twins?

A) About 1 in 30

B) About 1 in 90

C) About 1 in 400

D) About 1 in 1,000

Answer · why

B) About 1 in 90

About 1 in 90: a 2021 global study put twinning at 12 per 1,000 deliveries, while identical twins are rarer at roughly 3 to 4 per 1,000.

Q 03/05

Roughly how many twin sets per 1,000 births occur among West Africa's Yoruba people?

A) About 10

B) About 20

C) About 30

D) About 45

Answer · why

D) About 45

About 45 twin sets per 1,000 births, roughly 90 twins per 1,000 babies, several times the global average of about 12 sets per 1,000.

Q 04/05

A 2011 global study found the highest national twinning rate, 27.9 per 1,000 births, in which country?

A) Ghana

B) Brazil

C) Benin

D) Ireland

Answer · why

C) Benin

Benin topped the 2011 Smits and Monden survey at 27.9 twin deliveries per 1,000; the lowest rates, under 9 per 1,000, were in South and Southeast Asia...

Q 05/05

Igbo-Ora, nicknamed the 'Twin Capital of the World,' is a town in which country?

A) Nigeria

B) Kenya

C) Cameroon

D) Senegal

Answer · why

A) Nigeria

Igbo-Ora sits in Nigeria's Oyo State; locals credit the local diet, though researchers have found no proven cause for its twinning rate.