Explain the common progeny

Assignment Help Biology

Reference no: EM1391434

In Drosophila, a cross (cross 1) was made between two mutant flies, one homozygous for the recessive mutation bent wing (b) and the other homozygous for the recessive mutation eyeless (e). The mutations e and b are alleles of two different genes that are known to be very closely linked on the tiny autosomal chromosome 4. All the progeny had a wild- type phenotype. One of the female progeny was crossed with a male of genotype b e/ b e; we will call this cross 2. Most of the progeny of cross 2 were of the expected types, but there was also one rare female of wild- type phenotype.

a. Explain what the common progeny are expected to be from cross 2.
b. Could the rare wild- type female have arisen by (1) crossing over or (2)nondisjunction? Explain.
c. The rare wild- type female was testcrossed to a male of genotype b e/ b e (cross
3). The progeny were 1/6 wild type, 1/6 bent and eyeless ,1/3 bent, and 1/3 eyeless. Which of the explanations in part b is compatible with this result?
Explain the genotypes and phenotypes of the progeny of cross 3 and their proportions.

Reference no: EM1391434

Questions Cloud

Illustrate what factors might encourage or discourage shifts : Explain how might a industry's management decide whether it should continue to invest in current known technology or in new, but untested technology? Illustrate what factors might encourage or discourage such a shift?

Defective orders in a fast-food restaurant : Burger Doodle is a fast-food restaurant that processes an average of 680 food orders each day. The average cost of each order is $6.15. Four percent of the orders are incorrect, and only 10% of the defective orders can be corrected

Compute the average force the beam exerts on pile driver : Using energy considerations, compute the average force the beam exerts on the pile driver while the pile driver is brought to rest.

Why five stages in problem solving is effective : Explain in three to four sentences, in your own words, creative thinking. Describe in three to four sentences why using five stages in problem solving is effective.

Explain the common progeny : In Drosophila, a cross was made between 2-mutant flies, one homozygous for the recessive mutation bent wing and the other homozygous for the recessive mutation eyeless.

Explain how much do you imagine mcdonalds can let franchise : Explain how much do you imagine McDonalds can let franchise owners in international locations experiment before it risks losing the consistency it relies on for its competitive advantage?

How much additional income would the consumer need : How much additional income would the consumer need to reach the prior level of utility at the new prices and How many units of X and Y does the consumer purchase?

Three standard deviations above or below the centerline : Up to three standard deviations above or below the centerline is the amount of variation that statistical process control allows for

Define how much mechanical energy is lost : A 65.0 kg base runner begins his slide into second base when he is moving at a speed of 4.5 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base.

User Account

All Pages