Short hair (S) in rabbits is dominant over long hair (s). What would be the geno

Question

Short hair (S) in rabbits is dominant over long hair (s). What would be the genotypic and phenotypic ratio among progenies when two heterozygotic short haired rabbits were crossed? ina 1. Suppose you have two rose plants, both with pink flowers. You cross the two plants and are surprised to find that, while most of the offspring are pink, some are red and some are white. You decide that you like the re would like to make more. (a) What cross would you perform to produce the most red flowered plants? (b) Your mother decides she would like some of the pink flowered roses. Which cross would give you the most pink flowered plants? d flowers and 2. In northeast Oklahoma, there is a creature known as a Hillcat. It comes in three colors, blue, red, and white. This trait is controlled by a single locus gene with incomplete dominance. A homozygous (BB) individual is blue, a homozygous (bb) individual is white, and a heterozygous (Bb) individual is red. What would be the genotypes and phenotypes of the offspring if a blue Hillcat were crossed with a white one? Incomplete penetrance Club foot is one of the most common congenital skeletal abnormalities, with a world-wide incidence of about 1 in 1000 births. Both genetic and nongenetic factors are thought to be involved in club foot. Gurnett et al. (2008, American Journal of Human Genetics 83:616-622) identified a family in which club foot was inherited as an autosomal dominant trait with reduced penetrance. They discovered a mutation in the PITXI gene that caused club foot in this family. Through DNA testing, they determined that 11 people in the family carried the PITXI mutation, but only eight of these had club foot. What is the penetrance of PITXI mutation in this family? Coat colors of the Shorthorn breed of cattle represent a classical example of codominant alleles. Red is governed by the genotype c"c,roan (mixture of red and white) by c'c", and white by cMc a. When roan Shorthorns are crossed among themselves, what genotypic and phenotypic ratios are expected among their progeny? b. If red Shorthorns are crossed with roans, and the F1 progeny are crossed among themselves to produce the F2 what percentage of the F2 will probably be roan? inan Sickle cell anemia' is known as an example of a genetic disease that shows 'overdominance' characteristic in relation to malaria. Explain it.

Explanation / Answer

Mendel's inheritance:

Genotype of homozygous short hair rabbit - SS.

Genotype of homozygous long hair rabbit - ss.

Genotype of heterozygous short hair rabbit - Ss.

Cross between heterozygous short hair rabbit

Ss X Ss

Gametes formed S and s S and s

Next generation:

The phenotypic ratio - 3:1.

3 short hair rabbit and 1 long hair rabbit.

The genotypic ratio - 1:2:1.

1SS : 2Ss : 1ss.

Male/Female S s S SS( short hair rabbit ) Ss( short hair rabbit ) s Ss( short hair rabbit ) ss( long hair rabbit )

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