Question

I) What are the three characteristics of a balancer line and explain the maintenance required to keep a balanced stock.

II) What are the possible offspring for a male with a curly tail and a female with a normal tail and is not a carrier?

III) What genotype would have to be crossed with a non-flying male to get a non-flying female?

IV) If the mother is flightless and the father is flighted, what is the likelihood of their daughter flying?

VI) You have two pigs with pointy ears. What do their genotypes need to be to get true-breeding pointy-eared piglets?

Answer 1

1) alancer chromosomes have three important characteristics are they suppress recombination with their homologs, carry dominant markers, and negatively affect reproductive fitness when carried homozygously. Balancer chromosomes always contain a lethal recessive allele. This means that if an organism receives two copies of the balancer chromosome, one from the mother and one from the father, then the organism will not live. So any organism that is homozygous for that chromosome will not live to pass on its genes. thats how keep a balanced stock.

II) all offsprings are with normal tail

III) genotype can be x linked both recessive allele for no flying allele or it can be heterozygous for female

IV) likelihood of daughter flying is 100% as the girls always received X chromosome of father and one from mother, flighted is dominant thatswhy 100%

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