B) O C) bserve whether or not a recessive trait would reappear Observe whether o

Question

B) O C) bserve whether or not a recessive trait would reappear Observe whether or not the dominant trait would reappear D) Obtain a larger number of offspring on which to base statistics 23.When crossing an organism that is homozygous dominant for a single trait with producing an offspring with the recessive phenotype? an organism that is homozygous recessive, what is the probability of B) 25% C) 50% ) 100% 24. In a cross BbCcDd x BbCcDD, what is the probability of producing the genotype BBCCdd? (Note: none of the genes are linked...) A) 1/64 By 1/32 C) 1/16 D) 1/8 25. In snapdragons, heterozygotes for one of the genes have pink flowers whereas homozvgotes have either red or white flowers. When plants w red flowers are crossed with plants with white flowers, what proporti ing will have pink flowers?

Explanation / Answer

Answer:

23). A. 0%

Explanation:

In F1 generation, recessive phenotype is 0% whereas in F2 generation, it is 25%

AA x aa ---Parents

Aa (dominant phenotype)---F1

Aa x Aa

Aa

Dominanat phenotype = A_ -75%

Recessive phenotype = aa = 25%

24). E. 0

Explanation:

BbCcDd x BbCcDD

Bb x Bb = BB (1/4), Bb(1/2) & bb (1/4)

Cc x cc = CC(1/4), Cc(1/2) & cc (1/4)

Dd x DD = DD (1/2) & Dd(1/2)

The probability of BBCCdd = ¼ * ¼ * 0 = 0

A a A AA

Aa

a Aa aa

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