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3 years ago

Describe two benefits of using the SI system of measurement.

Biology

1 answer:

Natalija [7]3 years ago

8 0

Answer:

everyone agrees on what the SI Units are.

Explanation:

wherever you are in the world, a kilogram is a kilogram and a metre is a metre.

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A cross is made between homozygous wild-type female Drosophila (a^+ a^+ b^+ b^+ c^+ c^+) and triple-mutant males (aa bb cc) (the

marusya05 [52]

Answer:

a is the middle gene.

Distance [b-a]= 24.7 mu

Distance [a-c]= 15.8 mu

Distance [b-a} = 40.5 mu

Explanation:

A homozygous wild-type female drosophila (a⁺b⁺c⁺/a⁺b⁺c⁺) is crossed with a homozygous recessive male (abc/abc). <u>The order of the genes here is arbitrary. </u>

The F1 is heterozygous for the three genes (a⁺b⁺c⁺/abc). The F1 females were test crossed (crossed with abc/abc males).

The F2 shows the following phenotypic ratios:

320 a⁺b⁺c⁺
308 a b c
102 a⁺ b c⁺
112 a b⁺ c
66 a⁺ b⁺ c
59 a b c⁺
18 a⁺ b c
15 a b⁺ c⁺

Total = 1000

The male parent is homozygous recessive for the 3 genes, so the observed phenotypes of the offspring correspond to the gametes received from the mother.

Recombination during meiosis is a rare event, so the most abundant gametes are always the parentals: a⁺b⁺c⁺ and abc.

The least abundant gametes, following the same logic, are the double crossovers (DCO): a⁺bc and ab⁺c⁺.

<h3><u>1st. Determine the gene order</u></h3>

Compare the parental and the DCO gametes. The allele that is switched corresponds to the middle gene. In this case, gene a is in the middle of the other two.

<h3><u>2nd Determine the single crossover gametes</u></h3>

The F1 mother that generated all 8 types of gametes had the genotype b⁺a⁺c⁺/bac (correct order of genes).

The single crossover (SCO) gametes resulting from recombination between genes b and a are b⁺ac and ba⁺c⁺.
The single crossover (SCO) gametes resulting from recombination between genes a and c are b⁺a⁺c and bac⁺.

<h3><u>3) Calculate the recombination frequencies between genes </u></h3>

Recombination frequency (RF) = #Recombinants/Total progeny

RF [b-a]= (102+112+18+15)/1000= 0.247
RF [f-br]= (66+59+18+15)/1000= 0.158

<h3><u /></h3><h3><u>4) Calculate the distance in map units </u></h3>

Distance (mu) = RF x 100

Distance [b-a]= 0.247 × 100 = 24.7 mu

Distance [a-c]= 0.158 × 100 = 15.8 mu

Distance [b-a} = 24.7 mu + 15.8 mu = 40.5 mu

<h3><u>The gene map therefore looks like: </u></h3>

b------------24.7 mu--------------------------a---------15.8 mu-----------c

4 0

3 years ago

Protists vary in structure and function more than any other group of organisms. However, here are some common traits: a.All have

Sophie [7]

Answer:

a. eukaryotes

b. unicellular

c. autotrophs; heterotrophs

Explanation:

Protists represent a separate kingdom of eukaryotic organisms (ie., organisms whose cells have a nucleus). The most important features of protists include: 1- they are unicellular organisms, 2-contain mitochondria, 3-can be parasites, and 4-generally live in optimal conditions in moist or aquatic environments. In the past, protists were divided into Protozoa (animal-like organisms) and Protophyta (plant-like organisms), which nowadays we know are heterotrophic (also often parasitic) and photosynthetic protists, respectively.

3 0

3 years ago

A sample of rock is found to contain 100 grams of a parent isotope. How many grams of the parent isotope will remain after two h

Alja [10]

The answer is 50. I really hope this helps.

7 0

3 years ago

Read 2 more answers

first, drag the labels of group 1 to their respective targets to identify the types of sugars and the type of reaction shown.

Tasya [4]

drag the labels of group 1 to their respective targets to identify the types of sugars and the type of reaction shown .Disaccharide is created when a monosaccharide undergoes a dehydration event (loses water).

nomenclature and structures

The word "carbohydrate" refers to the majority of simple carbohydrates, which have the general elemental composition Cx(H2O)y. It is derived from the German "kohlenhydrate" and the related French "hydrate de carbone." According to the following imbalanced equation, their composition is related to the fact that they are created by photosynthesis from carbon dioxide and water:

Sugar + O2 + CO2 + H2O

The vast majority of naturally occurring carbohydrates present in living things, however, do not have the straightforward empirical formula Cx(H2O)y. Instead, the majority of naturally occurring carbohydrates are composed of oligomers (oligosaccharides or polymers (polysaccharides [Chapter 4]) by combining sugars with the other components of other molecules monosaccharide.

Learn more about monosaccharide here:

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6 0

1 year ago

Many living organisms respond to things in the environment called _____.

yanalaym [24]

The answer is Stimuli.

7 0

3 years ago

Read 2 more answers