Genetics Answers

A human female "carrier" who is heterozygous for the recessive, sex-linked trait red color blindness, marries a normal male. a. What proportion of their female progeny will show the trait? b. What proportion of their male progeny will show the trait? c. If one of their daughters marries a normal male, what is the probability that the first son of this marriage will show the trait? d. If one of their daughters marries a normal male, what is the probability that the first child of this marriage will show the trait?

In some types of wheat, color is caused by two sets of genes. Both dominant genes A and E are needed for red color. White results from both recessive genes in the homozygous state (aaee). Other combinations will produce brown wheat grains. A strain with the genotype Aaee is crossed with a strain having the genotype AaEe. What will be the frequency of red offspring?

How does gene recombination explain the various phenotype observed in F2 generation of dihybrid cross.

A disease causing allele is recessive. Assume that the male parent doesn’t have the disease and the female parent has the disease. What percentage of sons will have the disease?

Haemophilia is an X-linked disorder that occurs at a frequency of approximately 1 in 10000.

A normal male and a female who is heterozygous for the haemophilia mutation are expecting a child. What is the probability of this couple having a child with haemophilia? (Assume that all carrier females are asymptomatic.)

Is the Jacob and monod operon concept applicable to only prokaryotes or to also some of the eukaryotes ?

Explain how chromosomes and genes are related

Are all cells of living organisms identified genetically ?

The gene for tallness (T) in a pea plant is dominant over the gene for shortness (t). The Punnett square below shows the cross between two tall pea plants (Tt). What is the phenotypic ratio of the offspring produced as a result of the cross?

how artificial cloning helpful for humans?