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b1 dominant allele dwarfism work out

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What are the chances? In humans, acondroplasia “dwarfism” (D) is dominant over normal (d). A homozygous dominant (DD) person dies before the age of one. A heterozygous (Dd) person is dwarfed. A homozygous recessive individual is normal. A heterozygous dwarf man marries a dwarf heterozygous woman. 1. Work out the genotypes of the parents (parent’s genes). Mother Father 2. Set up a Punnett square with possible gametes (sex cells). Explanation 1: During meiosis (the formation of sex cells) one member (allele) of each gene pair separate. In this example, the male (Db) produces some sperm containing “D” (the allele for dwarfism) and some sperm containing “d” (the allele for normal). 3. Fill in the Punnett squares above to work out the possible combination for the offspring. Explanation 2: During fertilization sperm meets the egg. The Punnett square show us the possible combination of genes during fertilization. 4. Count the number of possible genotypes. Number of DD = ______ Number of Dd = ______ Number of dd = ______ 5. What is the predicted phenotypic ratio for the offspring? Number of dwarf child/offspring = ______ Number of normal child = ______ What is the probability of having a child that dies at one from this disorder? _____________ Fill in the circles only and go to step 3.

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Page 1: B1 dominant allele dwarfism work out

What are the chances? In humans, acondroplasia “dwarfism” (D) is dominant over normal (d). A

homozygous dominant (DD) person dies before the age of one. A heterozygous

(Dd) person is dwarfed. A homozygous recessive individual is normal. A

heterozygous dwarf man marries a dwarf heterozygous woman.

1. Work out the genotypes of the parents (parent’s genes).

Mother

Father

2. Set up a Punnett square with possible gametes (sex cells).

Explanation 1: During meiosis (the formation of sex cells) one member (allele) of each

gene pair separate. In this example, the male (Db) produces some sperm containing

“D” (the allele for dwarfism) and some sperm containing “d” (the allele for normal).

3. Fill in the Punnett squares above to work out the possible combination for

the offspring. Explanation 2: During fertilization sperm meets the egg. The Punnett square show us

the possible combination of genes during fertilization.

4. Count the number of possible genotypes.

Number of DD = ______

Number of Dd = ______

Number of dd = ______

5. What is the predicted phenotypic ratio for the offspring?

Number of dwarf child/offspring = ______

Number of normal child = ______

What is the probability of having a child that dies at one from this

disorder? _____________

Fill in the circles

only and go to

step 3.

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