1.) What genotype, when mated to a rose comb chicken will produce progeny that are
50% walnut and 50% pea comb?
2.) You are breeding rabbits and have developed a true- breeding line for a nuclear
genes that causes them to have ears that are much longer than normal. Longer ears are a recessive phenotype. To characterize this trait you perform reciprocal crosses and get
different results. In cross A you cross males with longer ears with normal eared females.
The progeny of cross A all have normal ears. In cross B you cross females with longer
ears with normal eared males, and all of the offspring have longer ears. You suspect that
the ear phenotype is regulated by a genetic maternal effect, and so you cross female
offspring from cross B with males that have normal ears. If this is a maternal effect trait
what would you expect the phenotypes of the offspring from this cross would be? Identify
the proportion for each type, and explain why
3.) Bumblebees are a species with haplo-dipoloid sex determination that perform dances
to tell their hive mates where to find food. An individuals dance pattern is genetically
determined. Bees with the dominant allele for the genes that controls dance behavior
perform round dances instead of spiral dances. The gene controlling dance behavior
segregates independently from the gene controlling bee color, for which the dominant
allele cause black body color and the recessive allele causes yellow body color.
You provide a female heterozygous for both genes a potential male mate that has a
yellow body and performs round dances. You later observe both male and female
a) What is the genotype of male and female parents?
b) What are the predicted genotypes and phenotypes of the offspring from this
cross? Differentiate classes based on sexes of the bees .
4.) Haemophilia is a blood clotting disorder in humans that follows a pattern of X- linked
recessive inheritance. A carrier female and affected male get married. What are the
predicted phenotypes of their offspring? Differentiate classes based on sexes of the
5.) In ladybugs, two alleles of one gene determine the character difference of red or white
bodies, and two alleles of a separate, independently assorting gene determine the
character of big or small body. Use the data from an experiment on mating below to
answer the following questions:
Red, big body X white, small body
All red, big
910 red, big
298 red, small
275 white, big
117 white, small
a) In thinking about body color, which trait is dominant? In thinking about body size
which trait is dominant?
b) Conduct a chi square analysis to determine if the experimental data are
consistent with the expected outcome based on Mendel’s law. Remember to
include a null hypothesis, the math, the number of degrees of freedom, the
critical value and your conclusion .
|Due By (Pacific Time)||09/29/2014 08:30 am|
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