24.In a cross BbCcDd x BbCcDD, what is the probability of producing the genotype
ID: 218464 • Letter: 2
Question
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 homozygotes have either red or white flowers, When plants w red flowers are crossed with plants with white flowers, what proportion the offspring will have pink flowers? A) 0% ) 25% ) 50% 75% R A 100% 26.Humans with both the IA and /B alleles for blood type have both A and B carbohydrates on their red blood cells, and are blood type "AB". This is example of A) PleiotropyExplanation / Answer
24. None of the genes are linked. Hence, they are independently assorting. Punnett square is as follows:
BbCcDd
BCD
BcD
BCd
Bcd
bCD
bcD
bCd
bcd
BbCcDD
BCD
BBCCDD
BBCcDD
BBCCDd
BBCcDd
BbCCDD
BbCcDD
bBCCDd
BbCcDd
BcD
BBCcDD
BBccDD
BBCcDd
BBccDd
BbCcDD
BbccDD
bBCcDd
BbccDd
bCD
BbCCDD
BbCcDD
BbCCDd
BbCcDd
bbCCDD
bbCcDD
bbCCDd
bbCcDd
bcD
BbCcDD
BbccDD
BbCcDd
BbccDd
bbCcDD
bbccDD
bbCcDd
bbccDd
The genotype BBCCdd is not observed as a progeny of this cross as the second parent has a dominant DD genotype while the first parent has Dd. In order to obtain a dd genotype, both parents hould have atleast one recessive d allele.
Right option is E. 0 probability.
25. Consider that R codes for red colour while r codes for white colour.
Hence, homozygous red flowers will be a genotype RR and homozygous white flowers have a genotype rr. The heterozygous pink flowers have a genotype Rr.
Punnett square for the cross between red and white flower plant is shown below:
Red flowers
RR
R
R
White flowers
rr
r
Rr
Rr
r
Rr
Rr
All plants are Rr, which give pink flowers. Hence, the probability of obtaining pink flowers is 100%.
Right option is E. 100%
BbCcDd
BCD
BcD
BCd
Bcd
bCD
bcD
bCd
bcd
BbCcDD
BCD
BBCCDD
BBCcDD
BBCCDd
BBCcDd
BbCCDD
BbCcDD
bBCCDd
BbCcDd
BcD
BBCcDD
BBccDD
BBCcDd
BBccDd
BbCcDD
BbccDD
bBCcDd
BbccDd
bCD
BbCCDD
BbCcDD
BbCCDd
BbCcDd
bbCCDD
bbCcDD
bbCCDd
bbCcDd
bcD
BbCcDD
BbccDD
BbCcDd
BbccDd
bbCcDD
bbccDD
bbCcDd
bbccDd
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