1) Consider the following crossinvolving five independently assorting genes: Aa

Question

1)      Consider the following crossinvolving five independently assorting genes:

Aa Bb Cc Dd Ee ´ Aa bb cc DD Ee

a.       What proportion of theprogeny will have the same phenotype asthe first parent?

b.      What proportion will will havethe same phenotype as the secondparent?

c.       What proportion will havea phenotype that is different from both parents?

d.      What proportion will have thesame genotype as the first parent?

e.       What proportion will havethe same genotype as the secondparent?

f.       What proportion will havea genotype that is different from both parents?

Explanation / Answer

Aa          Bb       Cc      Dd          Ee´           x                Aa bb cc  DD         Ee

½            ½            ½       ½    ½                                ½          1    1             1              ½

a.             What proportion of the progeny will have the samephenotype as the first parent?

           1/128-

Aa          Bb       Cc      Dd          Ee

Aa x Aa.... 1/4 will be Aa

Bb x bb.... 1/2 will be Bb
Cc x cc..... 1/2 will be Cc
Dd x DD.... 1/2 will be Dd
Ee x Ee.... 1/4 will be Ee

b.             What proportion will will have the samephenotype as the second parent?

Aa bb cc  DD          Ee-1/128-

Aa x Aa.... 1/4 will be Aa

Bb x bb.... 1/2 will be bb
Cc x cc..... 1/2 will be cc
Dd x DD.... 1/2 will be DD
Ee x Ee.... 1/4 will be Ee

     What proportion will have the samegenotype as the first parent? -1/128

What proportion will have the samegenotype as the second parent? -1/128

.       What proportion will have agenotype that is different from both parents?

                 =1- 1/64= 63/64

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