Genetics Answers

if there is incomplete dominance or codominance of 2 alleles how many phenotypes will be seen ina population

Suppose that your arm, hand and foot was made up of only one cell. What would happen if the cell stopped working or died?

A researcher studying genetic influences on learning compares the maze performance of four genetically different strains of mice, using eight mice per strain. Performance for the four strains were as follows:

A man with AB blood marries a woman with a heterozygous type B blood. What percentage of their children will have Type A blood?

The presence of horns in cattle is controlled by a single gene. The hornless (H) condition is dominant over the horned (h) condition. A hornless cow was crossed repeatedly with the same horned bull. The following results were obtained with the F1 offspring: 8 hornless, 7 horned. What are the parents’ genotypes? 

1. In rabbits, spotted fur is dominant over solid-coloured fur. A solid-coloured rabbit is mated to a homozygous spotted rabbit
2. What is the genotype of the offspring?
3. What is the phenotype of the offspring?
4. If two of the offspring are crossed, what would be the genotype and phenotype of the F2 generation?

Indicate clearly where the opportunities arise in meiosis for genetic variation and outline and illustrate briefly how this happens.

So by using CRISPR, which step in gene expression would you want to target and why?

Explain the terms Chromosome, Chromatid, Gene, Allele.

(Use genetic notation (symbols for alleles) and annotated diagrams to illustrate your response. Show links between the terms)

Given a cross between 2 plants. The male is pure with long stem and the female is pure with short stem. All F1 generation has long stems. a) Determine the dominant and the recessive alleles. b) Do the necessary factorial analysis to find the genotypic and phenotypic percentages of F1 and F2 generations