In a study of black guinea pigs and white guinea pigs, 100 black animals were crossed with 100 white animals, and each cross was carried to an F2 generation. In 94 of the crosses, all the F1 offspring were black and an F2 ratio of 3 black: 1 white. Which of the following explains why there were such different results for a cross of a black and a white guinea pig? The trait is determined by two loci; all of the black individuals were heterozygous at both loci. The trait is determined by a single locus; some black individuals were homozygous and others were heterozygous The trait is determined by two loci; some black individuals were homozygous at both loci and others were heterozygous'at both loci. The trait is determined by a single locus; all of the black Individuals were heterozygous.

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Answer 1

C) The trait is determined by two loci; some black individuals were homozygous at both loci and others were heterozygous at both loci. is the correct answer. This is due to the fact that guinea pigs have two alleles that determine the color of their fur.

When the black and white guinea pigs are crossed, the F1 offspring will all be black, as black is the dominant allele. This is because the F1 offspring will be heterozygous at both loci, meaning they will receive one allele for black fur and one allele for white fur. However, when these F1 offspring are crossed in the F2 generation, the offspring will be 3 black to 1 white, as some of the F1 offspring will be homozygous at both loci, meaning they will only receive one allele for black fur. Therefore, the difference in results is due to the fact that the trait is determined by two loci, with some of the black individuals being homozygous and others being heterozygous.

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In a study of black guinea pigs and white guinea pigs, 100 black animals were crossed with 100 white animals, and each cross was carried to an F2 generation. In 94 of the crosses, all the F1 offspring were black and an F2 ratio of 3 black: 1 white. Which of the following explains why there were such different results for a cross of a black and a white guinea pig? a)The trait is determined by two loci; all of the black individuals were heterozygous at both loci.  b)The trait is determined by a single locus; some black individuals were homozygous and others were heterozygous c)The trait is determined by two loci; some black individuals were homozygous at both loci and others were heterozygous at both loci.  d)The trait is determined by a single locus; all of the black Individuals were heterozygous.


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