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Concept explainers
Determine whether the statements below are true or false. If a statement is false, provide the correct information or revise the statement to make it correct.
a. If a dihybrid cross is performed, the expected genotypic ratio is
b. A student uses the product rule to predict that the probability of flipping a coin twice and getting a head and then a tail is
c. A test cross between a heterozygous parent and a homozygous recessive parent is expected to produce a 1:1 genotypic and phenotypic ratio.
d. The outcome of a trihybrid cross is predicted by the law of segregation.
e. Reciprocal crosses that produce identical results demonstrate that a strain is pure-breeding.
f. If a woman is heterozygous for albinism, an autosomal recessive condition that results in the absence of skin pigment, the proportion of her gametes carrying the allele that allows pigment expression is expected to be 75%.
g. The progeny of a trihybrid cross are expected to have one of 27 different genotypes.
h. If a dihybrid F1 plant is self-fertilized,
(1)
(2)
(3)
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Chapter 2 Solutions
Genetic Analysis: An Integrated Approach (2nd Edition)
- Match the terms with the best description. ___ dihybrid cross a. bb ___ monohybrid cross b. AaBbAaBb ___ homozygous condition c. Aa ___ heterozygous condition d. AaAaarrow_forwardshows the results of a dihybrid cross involving seed shape and seed color. a. What proportion of the round and yellow F2 progeny from this cross is homozygous at both loci? b. What proportion of the round and yellow F2 progeny from this cross is homozygous at least at one locus?arrow_forwarda. aabbccDd b. AabbCcDd c. AAbbCCddarrow_forward
- State the name of the analysis/ chart and explain in at least one sentence. Question #2 Which of Mendel's postulates can only be demonstrated in crosses involving at least two pairs of traits? State the postulate and explain in at least one sentence. D. Focus Question #3arrow_forwardWidow peak (H) is dominant to a straight hairline (h), and long eyelashes (E) are dominant to short (e). d. A homozygous widow peak man who is heterozygous for eyelashes mates with a straight hairline homozygous for long eyelashes woman. Genotype: A a Bb Complete the punnett square on the next page with this information. i. Use FOIL to determine the possible gametes and then create a dihybrid cross for this mating. Foil Method: A a B b O Gametes: AB Ab aB ab Example of how to write ratios. Ratios of possible phenotypes of offspring FOIL (mom) FOIL (dad) 2 tall: 2 short 2 HH: 2 hharrow_forwardPlease draw a punnett square for thisarrow_forward
- If these two individuals with the following characteristics are crossed Parent 1: blood type AB; heterozygous for H gene Parent 2: heterozygous B blood type; hh genotype What is the phenotypic ratio (blood type) of the F, generation? A. 4 AB: 1 A: 1 B: 2 0 B. 2 AB: 2 A: 4 B: no O C. 1 AB: 1 A: 2 B: 4 0 D. 1 AB: 1 A: 1 B: 10arrow_forwardsee photoarrow_forwardA. heterozygous blue-eyed man is marrying a homozygous brown-ayed woman. Determine the ratio of the following from the offspring. B. Genotype C. Phenotypearrow_forward
- Give only typing answer with explanation and conclusionarrow_forwardGive typing answer with explanation and conclusion "B"-yellow "b"-green. When 2 heterozygous parents for both traits are crossed it's called a dihybrid cross- AaBb × AaBb. Fill in the Punnett Square with the genotypes of this cross.arrow_forwardWhat sex is the normal human karyotype displayed here? (look at picture) A. Male B. Femalearrow_forward
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