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3 years ago

Why is there more biodiversity in a rainforest compared to a tundra?

2 answers:

7 0

Tundra has permafrost so everything is permanently frozen and therefore cannot support much life such as bacteria fish plants very few things live there, but a rainforest has many species and characteristics to support biodiversity

ohaa [14]3 years ago

3 0

Explanation:

because animals bacteria on n on that live in the rainforest nothing actually lives in a tundra

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Diagram A in Figure 3-1 is an example of ____.

AfilCa [17]

It's diffusion because it's movement from high to low concentration

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3 years ago

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A dihybrid cross produces 30 recombinant offspring out of a total of 1,000 offspring. What is the recombination frequency of the

uranmaximum [27]

The recombination frequency of the two gene pairs is 3%.

The number of recombinant offspring(r.o.) / total number of offspring x 100% = recombination frequency(θ):

r.o./total x 100% = θ

30/100 x 100% = 3%

Recombinant offspring are children that have a different allele combination to their parents.

For example, say a mother has a haploid cell with the alleles AB and the father has a haploid cell with the alleles ab. These combine to make a diploid cell with the sequence Aa+Bb.

Formation of Recombinant Offspring :

Recombination can happen in two different ways; independent assortment and crossing over.

Independent assortment is when the maternal and parental DNA are mixed during meiosis, creating a new gene sequence.
Crossing over happens during the first stage of meiosis when the two homologous chromosomes are paired and a portion breaks off on the same loci then reconnects to a different end. Crossing over can only happen when there isn't a physical linkage of the parental alleles.

Recombination frequency (θ) is the frequency with which a single chromosomal crossover will take place between two genes during meiosis. A centimorgan (cM) is a unit that describes a recombination frequency of 1%. In this way we can measure the genetic distance between two loci, based upon their recombination frequency. This is a good estimate of the real distance. Double crossovers would turn into no recombination. In this case we cannot tell if crossovers took place. If the loci we're analysing are very close (less than 7 cM) a double crossover is very unlikely. When distances become higher, the likelihood of a double crossover increases. As the likelihood of a double crossover increases we systematically underestimate the genetic distance between two loci.

When two genes are close together on the same chromosome, they do not assort independently and are said to be linked. Whereas genes located on different chromosomes assort independently and have a recombination frequency of 50%, linked genes have a recombination frequency that is less than 50%.

To learn more about Recombination frequency : brainly.com/question/7299933

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1 year ago

Which two particles add to make the mass number? a. protons b. neutrons

OlgaM077 [116]

Answer:

both A and B

Explanation:

Together, the number of protons and the number of neutrons determine an element's mass number.

3 0

3 years ago

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What is the major function of the exoskeleton of a crayfish

Kamila [148]

Answer:

The main function is protection, breathing and support.

Explanation:

An exoskeleton covers the entire surface of arthropod animals, such as arachnids, insects, crustaceans, etc. Its main function is the protection, breathing and support of the muscular system, favoring its fossilization.

8 0

3 years ago

Imagine that a couple is planning to have children. The male is heterozygous for tongue rolling and homozygous dominant for unat

Amiraneli [1.4K]

Answer:

F1 generation: RrUu, rrUU, rrUu, RrUU

25% : 25%: 25%: 25%

Ratios

genotype: 1: 1: 1: 1 ...(from punnet square)
phenotype: 1 : 1

Explanation:

Punnett squares are a diagrammatic way of deciding the characteristics of hybrid offspring created by crosses in genetic breeding. Parental genotypes and phenotypes are widely recognized, and all usually obey normal Mendelian ratios and inheritance.

Mendelian genetics focuses on the origin or heritability of characteristics. Such traits are packed into one's own gamete, acquired by themselves, and sometimes display superiority, where one's impact can mask those of another trait.

These are called the Law of Segregation, Independent assortment and Dominance respectively.

For this cross... Assuming:

Unattached lobes= dominant

Rolling tongue= dominant
Parent generation or P generation:

Gametes:

R → rolling dominant (R), non-rolling recessive (r)

U → unattached dominant (U), attached recessive (u)

P generation: RUrU× rUru

rolling, unattached × non-rolling, unattached

F1 generation: RrUu, rrUU, rrUu, RrUU

25% : 25%: 25%: 25%

Ratios

genotype: 1: 1: 1: 1 ...(from punnet square)
phenotype: 1 : 1

Half the offspring have unattached lobes and can roll their tongues while the other half have unattached lobes and cannot roll their tongues...

Each punnet cross is attached below

6 0

4 years ago