Construct Punnett grids for unlinked autosomal genes and derive expected genotype or phenotype ratios.
Tę umiejętność sprawdza 11 zadań wzorowanych na arkuszach IB z lat 2022–2026.
A model test cross investigates two autosomal loci in fruit flies. D (dark body) is dominant to d (pale body), and K (long wing) is dominant to k (short wing). A DdKk fly is crossed with ddkk. (i) Calculate the expected number for each phenotype under…
Use a Punnett grid or equivalent diagram to justify a1:1:1:1 phenotypic ratio from a cross between a plant heterozygous for leaf width and pigmentation and a narrow-leaved, green plant.
In a hypothetical beetle, two independently assorting genes determine elytral pigments. A dash means either allele can occupy the position. Genotype | Colour P_Q_ | violet P_qq | red ppQ_ | blue ppqq | ivory A violet PpQq beetle is crossed with a red Ppqq…
In a model insect, dark wings and long antennae are dominant traits. Which cross is most useful for testing whether the two loci are linked? A. A double heterozygote crossed with a double homozygous recessive B. Two double homozygous dominant parents C. A…
Informacja do zadań 4 a-4 b. Two pure-breeding lines of a model flowering plant both have cream petals. Line 1 has genotypeAAbb and line 2 aaBB. Their F 1 offspring all have violet petals. Self-fertilization of the F 1 gives an F 2 ratio of 9 violet:7 cream.…
Informacja do zadań 4 a-4 b. Two pure-breeding lines of a model flowering plant both have cream petals. Line 1 has genotypeAAbb and line 2 aaBB. Their F 1 offspring all have violet petals. Self-fertilization of the F 1 gives an F 2 ratio of 9 violet:7 cream.…
Informacja do zadań 4 a-4 b. Two pure-breeding lines of a model flowering plant both have cream petals. Line 1 has genotypeAAbb and line 2 aaBB. Their F 1 offspring all have violet petals. Self-fertilization of the F 1 gives an F 2 ratio of 9 violet:7 cream.…
Informacja do zadań 4 a-4 b. Two pure-breeding lines of a model flowering plant both have cream petals. Line 1 has genotypeAAbb and line 2 aaBB. Their F 1 offspring all have violet petals. Self-fertilization of the F 1 gives an F 2 ratio of 9 violet:7 cream.…
In a model plant, purple flowers (P) and tall stems (T) are dominant. A cross of PPTT with pptt produces PpTt offspring. These are crossed with each other. If the loci assort independently, how many of 640 second-generation plants are expected to be purple and…
In a model plant, purple flowers (P) and tall stems (T) are dominant. A cross of PPTT with pptt produces PpTt offspring. These are crossed with each other. If the loci assort independently, how many of 640 second-generation plants are expected to be purple and…
Two unlinked loci determine seed colour and surface texture, with complete dominance at each locus. Which cross can produce four phenotypes in equal expected proportions? A. RrTt × rrtt B. RRTT × rrtt C. RrTt × RrTt D. rrTT × RRtt
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