Genetics Answers

A DNA molecule is 20% thymine (T). What % of each of the other types of base would it contain?

The mRNA strand produced in the nucleus is complementary to the template strand of the DNA and a copy of the coding strand. Explain this:

why some kids in a family might have albinism and others might not?

The answer should be 8-10 sentences and must include the following words:

DNA

gene

protein

melanin

mutation

chromosome

meiosis

crossing over

dominant

recessive

heterozygous

homozygous recessive

Some dogs bark when trailing; others are silent. The barking trait is due to dominant alleles. Erect ears (tall ears) are dominant to drooping ears (small ears). What kind of pups would you expect from a heterozygous, tall ear barker mated with a dominant small ear silent trailer.

Freckles are dominant to no freckles. If a heterozygous mom and a homozygous dominant dad were crossed together how would that cross be written?

In rabbits, black hair is dominant to chocolate hair and straight ears are dominant to floppy ears. A male who is homozygous for both black hair and floppy ears is crossed with a chocolate female who has straight ears. Her father had floppy ears. (A) What would be the frequency of rabbits with chocolate hair? (B) If they had 30 baby rabbits, how many would have black hair and straight ear *

what is the advantage of a Hetrizygous?

a man with type A- blood and a women with type B+ blood marry and have 8 children. one of the children has type O- blood. what are the genotypes of the parents. what are probable genotypes and phenotypes of the 8 children.

I have a biology assignment involving questions about a pregnant female patient, 45, who has had an amniocentesis performed, and a fetal karyotype is given to help discern chromosomal abnormalities in the fetus. It is clear that the fetus has an extra chromosome 21, indicating Down's Syndrome...but the X and Y chromosomes also look as though they're practically "reversed", in the sense that the X is way too short and the Y is way too long. Is this typical of individuals with down's syndrome or does this also indicate some other abnormalities, perhaps with the sex organs or something else? So why has this happened to the X and Y chromosomes and what does (or could) it indicate?

Task 6. Fill in the table : "Classification of carcinogenic factors (external actors)^ n : 1 Mechanical carcinogens 2 . Physical carcinogens 3 Chemical carcinogens 4 . Biological carcinogens