Punnett square that combines all three genes may not be practical. Instead the laws of probability may be used. The product law of probabilities says that when alleles for separate genes segregate independently, we can figure out the probability of a particular combined genotype by multiplying the probability of the alleles for each gene. 13. We cross a homozygous tall pea plant with yellow, round seeds to a homozygous dwarf pea plant with green, wrinkled seeds. All the F1 offspring are all tall plants with yellow, round seeds. a. What are the expected F2 ratios (use fractions) of tall and dwarf plants? b. What are the expected'F2 ratios (use fractions) of yellow and green seeds?

Human Anatomy & Physiology (11th Edition)
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II III 51
6.
Section 5: Trihybrid cross and Laws of probability
For a trihybrid cross, in which inheritance of alleles for three genes is tracked; drawing a
Punnett square that combines all three genes may not be practical. Instead the laws of
probability may be used. The product law of probabilities says that when alleles for separate
genes segregate independently, we can figure out the probability of a particular combined
genotype by multiplying the probability of the alleles for each gene.
13. We cross a homozygous tall pea plant with yellow, round seeds to a homozygous dwarf
pea plant with green, wrinkled seeds. All the F1 offspring are all tall plants with yellow,
round seeds.
a. What are the expected F2 ratios (use fractions) of tall and dwarf plants?
b. What are the expected'F2 ratios (use fractions) of yellow and green seeds?
Transcribed Image Text:II III 51 6. Section 5: Trihybrid cross and Laws of probability For a trihybrid cross, in which inheritance of alleles for three genes is tracked; drawing a Punnett square that combines all three genes may not be practical. Instead the laws of probability may be used. The product law of probabilities says that when alleles for separate genes segregate independently, we can figure out the probability of a particular combined genotype by multiplying the probability of the alleles for each gene. 13. We cross a homozygous tall pea plant with yellow, round seeds to a homozygous dwarf pea plant with green, wrinkled seeds. All the F1 offspring are all tall plants with yellow, round seeds. a. What are the expected F2 ratios (use fractions) of tall and dwarf plants? b. What are the expected'F2 ratios (use fractions) of yellow and green seeds?
C. What are the expected F2 ratios (use fractions) of round and wrinkled seeds?
d. What are the possible F2 combined phenotypes and their expected ratios
(probabilities)?
Transcribed Image Text:C. What are the expected F2 ratios (use fractions) of round and wrinkled seeds? d. What are the possible F2 combined phenotypes and their expected ratios (probabilities)?
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Trihybrid cross is the cross between the two individuals of a species for studying the inheritance of three pairs of factors.

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