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Lady bird [3.3K]
2 years ago
3

In the first analysis all of the F1 flies from the students crosses have the identical phenotype with respect to body color and

wing shape but the F2 flies have four different phenotypes describe how fetilization contributes to this genetic variability?
Biology
1 answer:
klemol [59]2 years ago
5 0

Answer:

Through formation of zygote by using gene pool of two gametes

Explanation:

During fertilization, an offspring is produced from the gametes of parents. Due to independent assortment and recombination, each gamete has unique combination of gene because of the meiosis cell division. This leads to reshuffling of genes of the mating parents and thus causes genetic variation in a given population. This is the reason why offspring of the same parents differ from each other phenotypically. A zygote is formed when the gamete of the two mating parents combine.

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"Consider the following cross: Gl/gL x gl/gl Which combination(s) of alleles does the parent with the Gl/gL genotype contribute
mrs_skeptik [129]

Answer:

Gl, gL, GL and gl

Explanation:

The heterozygous parent has the genotype Gl/gL. Since this is a diploid individual, it has two copies of each autosomal chromosome. The slash "/" represents a separation between the two homologous chromosomes, <em>Gl</em> are the alleles of genes "G" and "L" present in one chromosome, and <em>gL</em> are the alleles of those genes present in the other chromosome.

During meiosis the total chromosome number of the original diploid cell is reduced by half, creating four haploid gametes. In a specific stage of meiosis, homologous chromosomes pair and crossing over occurs, when recombination happens and one of the alleles present in one chromosome "switches" to the other chromosome, increasing genetic variation.

<u>Therefore, the Gl/gL individual can produce four different types of gametes:</u>

Gl and gL (Parental --> no crossing over occurred)

GL and gl (Recombinant --> crossing over occurred)

3 0
2 years ago
Robert’s fraternal twin sister Desiree has a diagnosis of schizophrenia. Armend’s identical twin brother, Nigel, also has a diag
ioda

Answer:

The correct option is <em>lower.</em>

Explanation:

Schizophrenia can be described as an inherited disease and it is a type of mental illness. As Armend has an identical twin brother with diagnosis of schizophrenia hence, he will have more chances than Robert whose fraternal twin sister has schizophrenia.

As fraternal twins develop from two different eggs hence, the chances in them having the same disease will be lower. Identical twins develop from the same egg, hence they will have more chances of having the same inherited disease.

5 0
2 years ago
Which two life functions of animals help maintain the water cycle by recycling water back into the environment
Sholpan [36]
The answer has to be c
3 0
2 years ago
Read 2 more answers
Solar power is a renewable resource because _______.
Mamont248 [21]
<span>Solar power is a renewable resource because </span><span>it is continually replenished.</span><span>
</span><span>Final answer: A</span><span> </span>
3 0
2 years ago
Read 2 more answers
The flowchart below shows the three generations of a cross between a pea plant that has yellow pods and a pea plant that has gre
tresset_1 [31]

Hello. This question is incomplete. Also, you forgot to show the flowchart. The flowchart is attached below and the full question is:

The flowchart below shows the three generations of a cross between a pea plant that has yellow pods and a pea plant that has green pods. Green pods are the dominant trait. The flowchart is missing the labels that describe the traits.

In which squares should the phrase “Green pods” appear?

1.A and D  2.B and E  3.A,C and D  4.A,B,C,D and E

Answer:

3.A,C and D

Explanation:

As shown in the question above, the flowchart shows the crossing of a pea plant with dominant features (green pods - AA) and a pea plant with recessive features (yellow features - aa). The crossing between plants with AA and aa alleles generates a completely Aa population, which in this case, has the dominant characteristic, that is, it has green pods. This is because the "Aa" alleles are called heterozygous and develop the dominant characteristic.

As we can see in the flowchart, the crossing between the two pea plants generated an offspring that is identified by table C, as we know this offspring has green pods and in the flowchart it is represented by a grayish rectangle. Therefore, we can say that the other gray rectangles represent pea plants with green pods, which are rectangles A, C and D.

4 0
2 years ago
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