How will planting genetically modified crops affect chemical use on farms?

Why is it impotant for scientists toknow the structure of DNA

Hitman42 [59]

Watson and Crick described it well in their published work on DNA and its structure. ... This understanding of the structure of DNA is particularly important because it led to the realisation that if there is an adenine on one side of the pair, then the other base must be thymine.

7 0

3 years ago

How many cells are in your body.

trasher [3.6K]

About 37.2 trillion but it is very hard to determine

7 0

3 years ago

Read 2 more answers

Which mutation(s) cause the product to be a non-functional protein?

erica [24]

Answer:

The correct answer is - option D. nonsense and frameshift.

Explanation:

If there is a change in the sequence of DNA resulting in premature stop codon mRNA during transcription is known as a nonsense mutation and result in a non-functional protein.

a frame-shift mutation takes place when at least two nucleotides are altered and there are less chances to be changed by two others coding for the same nucleotide. It leads to a non-functional protein.

8 0

3 years ago

In rabbits, short hair is due to a dominant allele, S, and long hair to its recessive allele, s. Black hair is due to a dominant

Natali5045456 [20]

Answer:

SsBB x SsBB

or

SsBB x SsBb

Explanation:

SS- short hair

ss - long hair

BB- black hair

bb- white hair

Total the number of offspring produced = 2518+817=3335

Where 2518= short haired, black offspring SSBB or SsBb

817= Longed Hair, black offspring ssBB or ssBb

To get the offspring proportion for short hair black offspring

2518/3335×100 = 75.5%

long-haired, blackoffspring =817/3335×100 = 25%

This gives ratio of 3:1 as against the proposed dihybrid phenotypic ratio of Mendel experiment 9:3:3:1

Now, if you remember a dihybrid cross results in 9:3:3:1 phentoype ratio. That is when both parents are heterozygous for both alleles. So we can rule that out since it doesn't match our 3:1 ratio.

Since all the offspring are black , it means one parent is homozygous dominant for black and the other parent is either homozygous or heterozygous for the black allele.

Since the ratio is 3:1, for the hair length

That leaves us with the short hair. Since the ratio is 3:1, both parents are heterozygous for hair length.

Therefore, the possible parental genotype is

SsBB x SsBB

or

SsBB x SsBb

4 0

3 years ago

Describe three (3) common fungal respiratory infections and the name of the specific organism that causes them as well as some s

Aleks04 [339]

1. Pulmonary Blastomycosis: is transmitted from inhalation of spores from dust and iscaused by Blastomyces dermatitidis. It targets the lungs and shows signs of fever,chills, joint pain, muscle pain and headache and cough.

2. Histoplasmosis:caused by Histoplasma Capsulatum that is transmitted by theinhalation of spores near bird or bat droppings, it targets the alveolar in the lungs andshows signs related to the flu, and chronic cough.

3. Aspergillosis: this is caused by the organism aspergillus spp. It is transmitted by theinhalation of spores from moldy vegetation and targets the lungs. The symptoms arecough with blood, wheezing, fatigue, shortness of breath, fever and chills, chest pain,face swelling and skin lesions.

7 0

3 years ago