Mutation

Briefly describe how a mutation might alter gene function (at the molecular level) if it fell into the following categories. As an example, a neomorphic mutation could result from expressing a gene in a novel location. In your answer, you should state whether your example refers to altered gene expression or altered protein sequ ...continues

Drosophila

Kruppel and giant are 2 gap genes in drosophila for which the maternal effect gene bicoid serves as a transcriptional activator. Bicoid protein is present in an concentration gradient in the drosophila embryo, with the highest levels at the anterior end and progressively lower levels as one moves toward the posterior pole. a) ...continues

Allele frequency and Blood group system

In a particular random mating population, the frequency of the O allele of the ABO blood group system is .6, the frequency of A is .3, and the frequency of B is .1. a) If a type O man and a type A woman produce a child, what is the probability it will be type O? b) If their first child is type O, what is the probability t ...continues

Mitosis/ Chromosomes

HeLa cells (a strain of human cells cultured in the laboratory) have a mitotic cycle of about 24 hours, of which about 11 hrs is spent in G1, about 8 hrs in S, about 4 hrs in G2, and about 1 hr in mitosis. If you took a sample of HeLa cells from a culture, and looked at it through the microscope, in about what % of cells would y ...continues

Chromosome

Rarely, hens reverse phenotypic (not chromosomal dew late in life and develop into sprem producing males. If such a male were to be mated to a normal female, what sex ratio would be expected among the offsrping? (Eggs with no X chromosome do not hatch.)

Coefficient of Coincidence / Interference

F1 females from a cross of AABBCC to aabbcc were backcrossed to aabbcc males. IN the progeny of this cross there were 150 AaBbCc, 145 aabbcc, 55aabbCc, 52 AaBbcc, 31 aaBbcc, 29 AabbCc, 5 Aabbcc and 3 aaBbCc. Is there evidence of interference? What is the coefficient of coincidence?

Genetic Mitosis & Meiosis

1) According to the Law of Segregation, in an organism with the genotype AaBb what types of gametes will be formed? AB Ab aB ab 2) In garden peas, the allele for tall plants is dominant over the allele for short plants. A true-breeding tall plant is crossed with a short plant and one of their offspring is self-pollina ...continues

Mendelian problems

1. A short-tailed mutant of mouse was discovered. Multiple crosses of this mouse to normal mice produced 27 normal, long-talied mice and 25 short-tailed mice. A series of crosses among short tailed mice were made and 21 short-tailed mice and 11 long-tailed mice were produced. Determine which phenotype is dominant and explain ...continues

Breeding rabbits using a cross and key to support answer

If a rabbit breeder crossed a pure-bred white normal-coated male with a pure-bred black Havana female with satin coat and all the offspring were Havana black with normal coats. Then he crossed two of the Havana blacks with normal coats in hopes of obtaining a satin black Havana rabbit. What would be the likelihood of this ...continues

Expected phenotypic ratios

I need to be able to list the work and list the expected phenotypic ratios for the following crosses: A. If a red cow is bred with a white bull, all offspring are roan, which have red and white hairs intermixed on the hide. I know this is an example of co-dominance, but what are the results of roan x roan? B. If solid x sp ...continues