drag the given black and white squares to the correct location on the chart. each square can be used more…

Explanation:

Step1: Recall X - linked recessive inheritance rules

Males have one X and one Y chromosome (XY). A male is affected if his single X - chromosome has the recessive allele. Females have two X - chromosomes (XX). A female is affected if she has two copies of the recessive allele, a carrier if she has one copy, and unaffected if she has no copies.

Step2: Analyze the given pedigree

For the top - left couple (unaffected male and affected female), the affected female has two recessive alleles on her X - chromosomes. She will pass one of the recessive alleles to all of her sons. So, all sons of an affected female will be affected. Daughters of an affected female and an unaffected male will be carriers as they get one recessive allele from the mother and a normal allele from the father.

Step3: Fill in the boxes

For the first dashed box (son of affected female and unaffected male), it should be an affected male (black square). For the second dashed box (son of carrier female and unaffected male), since the carrier female has a 50% chance of passing the recessive allele to her son, and we assume normal inheritance patterns, this son could be unaffected (white square).

Answer:

The first dashed box (top - right of the middle generation): affected male (black square). The second dashed box (bottom - right of the middle generation): unaffected male (white square).