If in a standard dihybrid cross (AaBb x AaBb), there were a total of 80 observed for the F2 generation, what would be the expected number for the A_B_ phenotype?
A punnet square for AaBb x AaBb cross geneally have 9:3:3:1 phenotype ratio however for AaBb x AaBb dihybrid cross the phenotypic ratio is 9:3:4 .
Total phenotypic ratio = 9+3+4 =16
9/16 x 80 = 45
3/16 x 80 = 15
4/16 x 80 = 20
If in a standard dihybrid cross (AaBb x AaBb), there were a total of 80 observed...
You test-cross plants you suspect to be AaBb dihybrids and look at 100 offspring, with the following results: Phenotype AB 22 Ab 28 ab 29 ab 21100 total (for the purposes of this quiz, do not combine parental and recombinant classes) You wish to test the hypothesis that the data are best explained as a dihybrid test cross AaBb x aabb. 1)For a chi-square test, what expected number would you use for the aB class? 2)Calculate the chi-square value for...
In a cross involving two different characteristics (a dihybrid cross), the genotypes of the two parents are RRSS and rrss. Capital letters represent dominant alleles and lower-case letters represent recessive alleles. The “R” allele specifies round, and the “r” allele specifies oval. The “S” allele specifies smooth, and the “s” allele specifies rough (2pts) What is/are the expected genotype(s) of the F1 generation? What is/are the expected phenotype(s) of the F1 individuals? What are the predicted phenotypes for the F2...
explain why a is the answer 8. In the dihybrid cross AaBb x aabb, how many homozygotes are found among the Fi offspring? Marge One Two Three d) Four e) Five
2. In Mendelian segregation, a “dihybrid self” represents a F1 dihybrid that was crossed with itself (AaBb x AaBb). What are the expected F2 phenotypic ratios, if the F1 cross was actually Aa; Bb x Aa; bb? Show a punnet square.
In a cross between AABB x aabb, the ratio of F2 genotypes between AABB, AaBB, Aabb and aabb would be (a) 9 : 3 : 3 : 1 (b) 2 : 1 : 1 : 2 (c) 1 : 2 : 2 : 1 (d) 7 : 5 : 3 : 1.
2. Consider the following dihybrid testcross data: a_a_: 174 A bb: 77 aaB:73 aabb: 164 Phenotype Probability Observed (O) Expected (E) IO -EPVE Total What is the probability that the deviations are due to chance alone? Do the data support the hypothesis of a testcross ratio with independent assortment? Test whether each gene pair is behaving according to Mendel's law of segregation?
4. You cross individuals with the following Genotypes, AaBbDdEeFFGg & AaBbDDEeFfGg. Predict the proportion of offspring that would show the following Phenotype or Genotype? A) all Dominant Phenotypes, B) the Genotype: AabbDdEeFfgg, C) the Genotype: AABbDdEeFfgg, D) the Genotype: aaBbddEeffGg, & E) all Recessive Phenotypes. 5. You cross individuals with the following Genotypes, AaBbDdEeFFgg x AabbDDEeFfGg. If you produce 1000 offspring in this cross, predict the number of offspring that would have the following Phenotype or Genotype? A) all Dominant...
When two loci are unlinked, the offspring observed in a dihybrid cross in the F2 are: a.) all the recombinant types b.) all the parental types c.) 50% of recombinant, and 50% parental types d.) 25% of recombinant types, and 75% parental types e. None of the above
When two loci are partially linked, the offspring observed in a dihybrid cross in the F2 are: a. all the recombinant types b. all the parental types c. 50% of recombinant, and parental types d. 25% of recombinant types, and 75% parental types e. None of the above
Please answer with an explaination and square diagram A dihybrid cross between a plant homozygous for long and smooth leaves and a plant homozygous for short and hairy leaves produces all long smooth F1 offspring. F1 offspring are then crossed to produce an F2 generation. What would you predict for the ratio of F2 phenotypes?