Genetics Answers

What mutations are produced by ionizing and UV Radiation?

When round and yellow seeded pea plants (YYRR) are crossed with green wrinkled

(y y r r) seeded pea plants the F1 are yellow and round seeded plants (Yy Rr).

What will be the results when this F1 is crossed with round and yellow seeded parents? 

In a mating between two individuals that are heterozygous for a recessive lethal allele

that is expressed in utero, what genotypic ratio (homozygous dominant: heterozygous:

homozygous recessive) would you expect to observe in the offspring?

Imagine you are performing a cross involving garden pea plants. What F1, F2 offspring

would you expect if you cross true-breeding parents with green seeds and yellow

seeds? Yellow seed color is dominant over green.

What will be the appearance of (a) F1 and (b) F2 progenies when a pure (homozygous)

tall pea plant is crossed with a pure (homozygous) dwarf pea plant?

What observations led Mendel to conclude that traits were inherited as particles from

each parent?

Discuss the role the following pieces of evidence played in the making of chromosomal

theory of heredity:

a) The discovery of the white fly.

b) The microscopic evidence for chromosome pair crossing over.

c) The coupling factors on the Drosophila X chromosome.

A cross was made between pure breeding plants differing in

two characters (colour and shape of seed) and the progenies

were inter-crossed to produce F2 population. Four types of

phenotypes; yellow round (1108), yellow wrinkled (382), green

round (366) and green wrinkled (140) were observed in F2.

Outline the significance of the formation of the triplex invasion to potential therapeutic applications.

Describe your understanding of a Hoogsteen pair and the formation of nucleic acid triplex. Is this held together by an intermolecular bond or an intramolecular bond?