Question

1. A plant with red flowers is crossed with a white-flowered plant of the same species. All the seeds, when grown, produce plants with red flowers. Assuming that the flower color is controlled by a single pair of alleles, which allele is dominant and which is recessive?

2.  How does inbreeding increase the incidence of recessive disorders in a population?

3.  Why does an individual always have only two alleles for a given gene?

4.  In cats, the allele (S) for short fur is dominant to the allele (s) for long fur. What is the phenotype of a cat with the genotype Ss?

Answer 1

answers

1)

2)

Inbreeding increases the rate of homozygosity ,which enhance the chance of expression of recessive alleles in a population.Due to inbreeding existing harmful mutations in a familys genome may come together and may get expressed.

3) A diploid organism has two copies of each chromosome one from father and other from mother .each chromosome contain one allele type of a gene. thus two alleles make up the individual's genotype. an organism can have two of the same alleles of a gene because alleles can be dominant, recessive, or codominant to each other. Eventhough only two alleles are seen in a person  ,more than two alleles can exist in the population's gene pool.

4)

S-dominant-short fur

s-recessive-longfur

Ss= S will be dominant therefore phenotype is short fur.