These diagrams can show that the expected phenotypic ratios for a dihybrid cross are nine to three to three to one. For 10 points each:
[10e] Name these diagrams in which allele combinations are written down the left side and across the top in order to determine the expected ratio of offspring.
ANSWER: Punnett squares
[10m] The above ratio from a dihybrid cross assumes that this law holds. This law of inheritance states that two alleles at two different loci do not influence each other when they are packaged into gametes.
ANSWER: Mendel’s law of independent assortment [accept Mendel's second law]
[10h] In this kind of cross, an organism with an unknown genotype but dominant phenotype is crossed with an organism with the recessive phenotype.
ANSWER: test cross
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