Question

Biol 189 0. Allele "l' is a recessive allele that results in short cars in rabbits, while 'L' is the dominant, long ear allele. a) What gametes would be produced by a heterozygote? 6 bunicat36690OS 0 1261 b) Assuming complete dominance, what fraction of offspring would have short ears if you crossed a heterozygous rabbit with a homozygous recessive rabbit? SSSS 1802 403 Ri p osa bence c) What are the phenotype ratios of the offspring in a cross between two heterozygous parents? sb 7. From Campbell. 10e) The pedigree below traces the inheritance of alkaptonuria, a biochemical disorder. Affected individuals, indicated here by the colored circles and squares, are unable to metabolize a substance called alkapton, which colors the urine and stains body tissues. Does alkaptonuria appear to be caused by a dominant allele or by a recessive allele? Fill in the genotypes of the individuals whose genotypes can be deduced. What genotypes are possible for each of the other individuals? George Arlene CO Sandra Tom Sam Wilma Ann Michael O Carla Daniel Alan Tina Christopher

Answer 1

6. a)

The gametes that would be created by a heterozygote would contain 50% of recessive allele "l" and 50% of dominant allele "L". The heterozygous singletons will show the genotype of one allele in some parts of the body while they will show the genotype of other allele in other parts of the body. A gamete consists of basically one chromosome from each chromosome pair. The carriers are always heterozygous in nature. The sequence of the DNA basically differs from one individual to another. These fluctuations are called as alleles.

b)

Complete dominance is referred to as that condition where the allele which is considered to be as dominant, entirely camouflages the recessiveness of the other allele. Assuming complete dominance, 50% of offsprings will have short ears if a heterozygous rabbit is crossed with a homozygous recessive rabbit.