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Complete the Punnett square on the right to show how sex is determined in humans.

Inheritance

1

a.Complete the Punnett square on the right to show how sex is determined in humans.

b.What percentage of children do you expect will be girls? Explain your answer.

c.What do the letters X and Y represent?

d.What are the names of the male and female human gametes ?

2 Some pea plants have yellow peas and others have green peas. The allele for yellow (Y) is dominant.

a.Complete the Punnett square to show the possible combinations of alleles in the offspring when two pea plants are crossed.

a.What is the ratio of yellow peas to green peas in the offspring?

b.What is the probability that one of the offspring plants will have yellow peas?

3.A genetic disorder called MCADD can cause people to feel sick and have fits if they do not eat for a long period of time. The disorder is caused by a recessive allele (d). The family pedigree chart below shows how this disorder has been passed down in one family.

a.Give the name of a male who is homozygous for the dominant allele. _________________________

b.The shading has been done correctly for the males but not for the females. On the diagram, shade in the females who have MCADD.

c.State the genotypes of: Gary _____________ Jerry ____________ Henry __________________

d.Calculate the probability that another child of Gary and Ling?s would have MCADD. _Inheritance

1

a.Complete the Punnett square on the right to show how sex is determined in humans.

b.What percentage of children do you expect will be girls? Explain your answer.

c.What do the letters X and Y represent?

d.What are the names of the male and female human gametes ?

2 Some pea plants have yellow peas and others have green peas. The allele for yellow (Y) is dominant.

a.Complete the Punnett square to show the possible combinations of alleles in the offspring when two pea plants are crossed.

a.What is the ratio of yellow peas to green peas in the offspring?

b.What is the probability that one of the offspring plants will have yellow peas?

3.A genetic disorder called MCADD can cause people to feel sick and have fits if they do not eat for a long period of time. The disorder is caused by a recessive allele (d). The family pedigree chart below shows how this disorder has been passed down in one family.

a.Give the name of a male who is homozygous for the dominant allele. _________________________

b.The shading has been done correctly for the males but not for the females. On the diagram, shade in the females who have MCADD.

c.State the genotypes of: Gary _____________ Jerry ____________ Henry __________________

d.Calculate the probability that another child of Gary and Ling?s would have MCADD. _

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