Question

on a pedigree chart, what does a filled in square represent? *

an unaffected male

an affected female

an unaffected female

an affected male

what do half colored symbols represent? *

the individual is a carrier (heterozygous).

the individual expresses the trait.

the individual has both recessive alleles.

the individual has both dominant alleles.

what does an open circle represent? *

an unaffected male

an affected male

an unaffected female

an affected female

Explanation:

• In a pedigree chart, a filled - in square represents an affected male. Males are represented by squares in pedigree charts, and a filled symbol indicates the presence of the trait (affected).
• Half - colored symbols represent that the individual is a carrier (heterozygous). Carriers have one normal allele and one allele for the trait (in the case of recessive traits), which is symbolized by a half - colored symbol.
• An open circle represents an unaffected female. Females are represented by circles in pedigree charts, and an open symbol indicates the absence of the trait (unaffected).

Answer:

• First question: an affected male
• Second question: The individual is a carrier (heterozygous)
• Third question: an unaffected female