## Biology, Pages 251-265Neil Campbell and Jane Reece's BIOLOGY remains unsurpassed as the most successful majors biology textbook in the world. This text has invited more than 4 million students into the study of this dynamic and essential discipline. |

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Page 24

Note that if an organism has identical alleles for a particular character — that is ,

the organism is true - breeding for that character — then that allele is

all gametes . But if different alleles are

...

Note that if an organism has identical alleles for a particular character — that is ,

the organism is true - breeding for that character — then that allele is

**present**inall gametes . But if different alleles are

**present**, as in the Fı hybrids , then 50 % of...

Page 46

The same odds apply to each sperm cell produced . For a particular F2 plant to

have wrinkled seeds , the recessive trait , both the egg and the sperm that come

together must carry the r allele . The probability that 2 two r alleles will be

...

The same odds apply to each sperm cell produced . For a particular F2 plant to

have wrinkled seeds , the recessive trait , both the egg and the sperm that come

together must carry the r allele . The probability that 2 two r alleles will be

**present**...

Page 47

two r alleles will be

the egg will have an r ) x 1/2 ( the probability that the sperm will have an r ) . Thus

, the multiplication rule tells us that the probability of an F2 plant with wrinkled ...

two r alleles will be

**present**in gametes at fertilization is 1/2 ( the probability thatthe egg will have an r ) x 1/2 ( the probability that the sperm will have an r ) . Thus

, the multiplication rule tells us that the probability of an F2 plant with wrinkled ...

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### Common terms and phrases

affect appearance apply blood group breeding brown called carbohydrate chance Chapter characters chromosomes coin combinations complex Concept consider depending determine developed dihybrid disease dominant allele enzyme equal event example experiments F1 hybrids F2 offspring factor Figure Fı plants flower color four gametes garden peas genotype green heads heritable heterozygotes heterozygous homozygotes homozygous human hybrids hypothesis identical incomplete dominance independent assortment individuals inheritance law of independent law of segregation locus mated Mendel Mendelian genetics molecules monohybrid cross multiple normal observed occur organism organism's pairs parent particular pea plants phenotypic ratio pigment population possible Ppyyrr predicted present principles produced Punnett square purple flowers purple-flower range recessive allele recessive trait red blood cells refer relation round rules of probability seed seed shape self-pollinate separate simple single gene specific studied toss true-breeding variations varieties vary white flowers white-flower allele wrinkled YyRr