Analyze the provided pedigree chart: identify diagram type, count females, count affected F1 males, and determine Kate's genotype.

The diagram illustrates the inheritance pattern of a genetic trait across multiple generations within a family.

• The type of diagram shown is a pedigree chart.

Question 3.1.2

• Generation I: 2 females (Kate and her sister)
• Generation II: 2 females (Helen and her sister)
• Generation III: 2 females (daughters of Helen and Ben)

• There are a total of 6 females in this family.

Question 3.1.3

The F1-generation consists of the children of the initial parents (Steve and Kate), which is the second row of individuals. Males are represented by squares, and affected individuals are shaded.

• In the F1-generation, there are two males. One is Ben (unaffected, unshaded). The other is Ben's brother (affected, shaded).

• 1 male in the F1-generation has Goltz syndrome.

Question 3.1.4

Goltz syndrome is a sex-linked dominant disorder (allele X$^{G}$). Unaffected individuals have the recessive allele X$^{g}$.

• Kate is an affected female (shaded circle).
• Kate's father, Steve, is an unaffected male (unshaded square), so his genotype is X$^{g}$Y.
• Since Kate inherited an X chromosome from her father, she must have inherited X$^{g}$ from Steve.
• As Kate is affected, she must also possess the dominant allele X$^{G}$.

• Therefore, Kate's genotype is $\boxed{\text{X}^{G}\text{X}^{g}}$.

Question 3.1.5

• Helen is an unaffected female (unshaded circle). Since Goltz syndrome is dominant, an unaffected female must be homozygous recessive: X$^{g}$X$^{g}$.
• Ben is an unaffected male (unshaded square). His genotype is X$^{g}$Y.

Sons inherit an X chromosome from their mother and a Y chromosome from their father.

• Helen (X$^{g}$X$^{g}$) can only pass an X$^{g}$ chromosome to her sons.
• Ben (X$^{g}$Y) passes a Y chromosome to his sons.
• Therefore, all sons will have the genotype X$^{g}$Y.

• A genotype of X$^{g}$Y means the individual does not have the dominant allele for Goltz syndrome.

• The phenotype of their sons will be unaffected.