Biology : 5. GENETICS

अब Quizwiz के साथ अपने होमवर्क और परीक्षाओं को एस करें!

How can knowledge of genetics be used to improve the agricultural production of food?

Using our knowledge of genetics, we can change, improve, add or get rid of certain genes for the better of the crop and food industry. Take, for example, Bt corn. What this is, is corn that has had its genetics changed for better production. What farmers saw was that there were insects and parasites coming and eating all the corn. They would then apply too much spray on the corn to get these insects away that it would harm the people who at it. How they fixed this was changed the corns genetics to produce a similar chemical. This chemical, as soon as the insect takes a bit would kill it. This, however, has no effect on humans since we do not have the same digestive track as these insects, and even if we did, our stomachs are too acidic and this poison would just die right away.

Why didn't Charles Edward, the grandson of Queen Victoria, receive hemophilia from his father Leopold?

because the disease is not on the "Y" chromosome and Helena did not have the trait

"Linkage" refers to genes for different traits

being located on the same chromosome

A pedigree chart can show a trait that is:

both dominant and a mutation

If the parent genotypes are Aa and Aa, the offspring are expected to be: 1/2 AA and 1/2aa all Aa 1/4 AA, 1/2 Aa, 1/4 aa 3/4 AA and 1/4 aa

1/4 AA, 1/2 Aa, 1/4 aa

DNA was discovered in:

1953

The second generation phenotypes resulting from the cross of true-breeding monohybrid pollination will display a ratio of: 1:4 1:2 1:3 none of the above

1:3

Indicate the phenotypic ratio of crossing the offspring of the agouti and chinchilla. 3/4 agouti, 1/4 chinchilla 3/4 agouti, 1/4 albino 1/2 agouti, 1/2 albino 3/4 albino, 1/4 agouti

3/4 agouti, 1/4 chinchilla

This cross will yield four phenotypes in the 1:1:1:1 ratio: rryy x rryy RrYy x rryy RrYy x RrYy RRYY x rryy

RrYy x rryy

Radiation damage has hereditary effects if it: changes proteins in the cytoplasm alters the DNA in somatic cells alters the DNA is autosomes alters the DNA in gametes

alters the DNA in gametes

Mendel's principle of segregation implies that the two members of an allelic pair of genes:

are distributed to separate gametes

Nitrogen bases are found on the DNA twisted ladder:

as the rungs

Within a set of human chromosomes, 22 pairs are called:

autosomes

Each P1 parent of a monohybrid cross has completely identical genes. True False

false

Genes that carry contrasting inheritance factors are called:

heterozygotes

An organism possesses one copy of each allele type for a given gene. It is said to be... homozygous recessive for both alleles heterozygous for the gene genotypically inactive

heterozygous for the gene

When the alleles of a gene pair are identical they are said to be:

homozygous

When neither of the genes of a pair are dominant nor recessive, the genes are said to be:

incomplete dominant alleles

Segregation and independent assortment of genetic material occurs during:

meiosis

Sex cells are produced in a process called____

meiosis

In the Watson-Crick model of a double helix, the "steps" of the "spiral staircase" are composed of:

nitrogen bases

Failure of homologous chromosomes to separate during meiosis is called gene _______ .

nondisjunction

Represented by word descriptions, such as black and short-haired:

phenotype only

What is meant by homologous chromosomes? chromosomes are found in pairs the gene's alleles are found in matched chromosome pairs all chromosomes contain the same genes each homologous chromosome has identical genotypes

the gene's alleles are found in matched chromosome pairs

Fertilization produces in the offspring:

double the haploid number of chromosomes

How can a mutation be inherited?

through gamete reproduction and fertilization through meiosis and fertilization

As a result of nondisjunction, a female gamete may contain:

two sex chromosomes no sex chromosomes


संबंधित स्टडी सेट्स

Patient Care in Radiography Chapter 06

View Set

Directing Function of Management

View Set

Chapter 6 - Early Civilizations in the Indian Subcontinent

View Set

bilogy quiz 3 sexual reproduction

View Set

Entrepreneurship Final Revised Dr. Bell

View Set