From a mating of two dihybrid individuals (e.g. AaBb x AaBb) how many of the 16 possible zygote combinations would be expected to contain only two dominant genes? (Assume that the two pairs of genes are located on different chromosomes).
In pea-plants, flower colour and height are determined by single pairs of alleles. The genes for red colour and tallness are dominant.
Two flowers were crossed, and the offspring (F1) were self-pollinated. The results in the F2 generation were as follows: 280 tall red; 90 tall white; 94 dwarf red; 30 dwarf white.
Which one of the following is a possible description of the parental generation?
- Heterozygous tall red x heterozygous dwarf white
- Homozygous tall red x homozygous dwarf white
- Heterozygous tall red x homozygous dwarf white
- Homozygous tall white x heterozygous dwarf red
- Homozygous tall red x heterozygous dwarf red
Questions From a mating of two dihybrid individuals (e.g. AaBb x AaBb) how many of the 16 possible zygote combinations would be expected to contain only two dominant genes? (Assume that the two pairs of genes are located on different chromosomes). In pea-plants, flower colour and height are determined by single pairs of alleles. The genes for red colour and tallness are dominant. Two flowers were crossed, and the offspring (F1) were self-pollinated. The results in the F2 generation were as follows: 280 tall red; 90 tall white; 94 dwarf red; 30 dwarf white. Which one of the following is a possible description of the parental generation? - Heterozygous tall red x heterozygous dwarf white - Homozygous tall red x homozygous dwarf white - Heterozygous tall red x homozygous dwarf white - Homozygous tall white x heterozygous dwarf red - Homozygous tall red x heterozygous dwarf red What is the probability that the son of a female carrier of haemophilia and a normal male will be haemophiliac? Red-green colour blindness in mammals is a sex-linked recessive trait. If a colour-blind female is crossed with a normal male then what is the theoretical ratio of the offspring? Assume that in a certain mammal the inheritance of skin colour is controlled by two pairs of genes, A-a and B-b, which are inherited independently. The genes for dark pigmentation A and B are incompletely dominant and produce about the same amount of pigmentation. If skin colour is proportional to the sum of the dominant genes present, how many classes of skin colour would be expected to be distinguishable from a mating between two doubly heterozygous individuals? In the sweet pea plant, flowers may be either purple or white. The colour is determined by two allelomorphic pairs of genes (R, r and S, s). If at least one dominant gene from each allelomorphic pair is present, then the flower colour is purple. All other genotypes are white. If two purple plants each of the...
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