Someone help here please (12) A breeder of pet fur flops has a cage of fur flops
ID: 211193 • Letter: S
Question
Someone help here please
(12) A breeder of pet fur flops has a cage of fur flops that often produces individuals with exceptionally long and tall ears. There is a new mutation in his crop of flops. He crosses one of his long eared males to a normal female, and he gets the following litter of fur flops: 16 long-eared males 15 long-eared females 17 normal males 16 normal females a) Would you describe this as more like a "self cross" or a "test cross"? ( point) b) What ratios do you see in this litter? (2 points) What does the result of this cross suggest about the long-eared allele? What genotypes would you suspect these animals have? (Explain your notation for alleles.) (3 points) Your friend likes the look of long ears on the fur flops, so he decides to work towards having d fur flops. He crosses a long-eared male to a long- eared female from the previous litter. Here is the resulting litter of fur flops from this cross: 18 long-eared males 17 long-eared females 8 normal males 9 normal females d) What ratio do you see in this litter? (2 points) . e) What does this result suggest about genotype and phenotype of the progeny? (2 points) f) How would you advise your friend to proceed in his plan to obtain a pure-breeding strain of long-eared fur flops? What would be the next step that he should take? (I point)Explanation / Answer
12) a) It is a test cross a genetic cross between a homozygous recessive individual and a corresponding suspected heterozygote to determine the genotype of the latter. So it is a test cross between the mutated long eared flops and the normal flops.
12)b) The ratio of Long eared males and females is 1.066. The ratio between Normal eared males and females is 1.062. The ratio between Long eared cups and Normal eared flops is 1.03.
12)c) The long eared allele has been expressed equally in both males and females. It is phenotypically dominant and the genotypic nature of this allele could be heterozygous.
12)d) The ratio of long eared Males to Long eared females is 1.05. The ratio between normal eared males and females is 0.8. The ratio between male flops and female flops is 1.31.
12)e) In the ratio seen in this second generation of crossing Long eared flops is giving the phenotypic results as the allele is being dominant and is being equally present in both males and females. The genotypic nature of this allele is heterozygous dominant in nature. This could be explained with the increase in number of long eared flops being produced in the second generation of breeding.
12)f) The next step would be to take the long eared flop of pet that was first with this mutation and breed with the offsprings of the recent generation with Long eared flop. This would give the pure strains in the offsprings. To continue this long eared flops he must keep breeding the offsprings with only Long eared parents. This would give him good results and no chances of the allele not being expressed.
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