Genetics Answers

In Drosophila (fruit flies), cut wings are controlled by a recessive X – linked allele
(ct), and fuzzy body is controlled by a recessive autosomal allele (fy). When a
fuzzy female is mated with a cut male, all the members of the F1 generation are
wildtype. What are the genotypic and phenotypic ratios of the F2 by sex?

Hybridization of a homozygous dominant and homozygous recessive plant was conducted. What is the probability that the F2 will have the phenotype big oval shaped yellow leaves, white flowers, and pink fruits?

You found morning glory plants in a field by your house with flowers that can have two different colors: dark purple (CPCP) or white (CWCW). You pollinate purple flowers with pollen from white flowers. When you grow the F1 progeny you get plants with only light purple flowers! (1) Name the inheritance pattern that likely led to these phenotypes. If you self-pollinate the F1 progeny, use a Punnett square to predict (2) the genotypic ratio and (3) phenotypic ratio for flower color in the F2 progeny.

Marfan syndrome disease and brown color of eyes are autosome dominant characters. Determine the genotypes and phenotypes of children, if a diheterozygous brown-eyed man with Marfan syndrome got married to a blue-eyed healthy woman.

Achondroplasia and syndactyly are autosome dominant disorders in a human. In a family, where father had achondroplasia and normal structure of hand; mother had syndactyly and without achondroplasia, there were born a healthy daughter. Determine the probability of birth of the next healthy child.

Myopia is autosome dominant characters, in humans. A man with myopia got married to healthy woman. Both parents are homozygotes. Determine the parental genotypes the probability of birth of sick children.

Brachydactyly is autosome dominant character in humans. A man with brachydactyly (heterozygote) got married to a healthy woman. Determine the genotypes of parents and the probability of birth of healthy children.

One of the chromosome in a nucleus has a telomere which contains many repeats of the base sequence TTAGGG.
This chromosome was extracted from four different cells and the total number of bases in the telomere was determined.
Which total number of bases was found in the cell that had gone undergone the most mitotic divisions