Answer:
B) 5
Explanation:
Pedigree charts can be read like family trees, and you can trace a trait through families. Squares usually refer to males, and circles refer to females. Shaded shapes usually refer to the presence of a specific trait, whereas blank shapes are those who do not possess the trait of interest.
The horizontal line between 1 and 2 shows that these individuals have had offspring.
If you follow that vertical line down to the next level, you can see it forms 5 branches - to individuals 3, 5, 7, 8 and 10. Therefore, 1 and 2 had five offspring.
Then, individual 3 had two children with individual 4 (see the horizontal line) - individuals 11 and 12.
Individual 5 had three children with individual 6 - individuals 13, 14, and 15.
Individual 7 did not have any children. Neither did individual 8
Individual 10 had four children with individual 9 - individuals 16, 17, 18 and 19.
