Genetics Answers

The genetic code consists of 3-letter words. What does this mean?

There are 2 main classes of mutations : (i) Point mutations, (ii) Insertion/deletion mutations.

In groups of 3, research and state how each of these mutations can alter the DNA sequence.

What type of diseases can result from DNA copying going wrong?

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?