Download PunnettssquareWorksheet-1

Punnett’s Square for the Baby/Heredity Project
Name: __________________________ Partner: ___________________________ Period: ____
Directions: Complete the Punnett’s square, percentages and fractions below. Add a final
copy/draft of the Punnett’s square, percentages and fractions to your Baby/Heredity Project
Scrapbook.
Use the Punnett’s square found on page 324, Figure 12.10, Biology, The Dynamics of Life to
complete the Punnett’s square below.
Gender Inheritance
X
Y
Male
X
F
e
m
a
l
e
X
X
Determine the following:
Fraction of the female gender (XX) genotype _____
Percentage of the female gender (XX) phenotype ______%
Fraction of the male gender (XY) genotype _____
Percentage of the male gender (XY) phenotype ______%
Males biologically determine the gender of the baby.
The sperm (male haploid gamete) carries either one X gender chromosome or one Y gender
chromosome.
The egg (female haploid gamete) carries only the X gender chromosome.
When the egg and sperm unite they form a diploid zygote. Under proper pregnancy conditions
the zygote develops into a fetus and eventually a baby will be born.