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4 years ago

Which of these implants itself into the wall of the uterus during pregnancy?

1 answer:

6 0

Implantation is the major sign of pregnancy for various women, it is a stage in which a zygote of fertilized egg limplants into the wall of the uterus.

Implantation usually takes place 6 to 10 days post ovulation, or day 20 to 24 of a menstrual cycle. However, it can take place a few days later or earlier. Once fertilization takes place, the egg remains the fallopian tuve for three days prior of getting inside the uterus and starts to implant itself to the walls of the uterus.

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Which of these describes a quantitative observation?

r-ruslan [8.4K]

D. is the answer

Malory

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3 years ago

A gene sequence reads ATCGAT. which represents a substitution mutation.

KIM [24]

Answer:

Explanation:

A substitution is where a base is substituted by another base

A. ATGAT - this is not a substitution, the C has been deleted

B. UAGCUA - this is not a substitution, but is the complementary mRNA sequence (you can tell because there are Us instead of Ts)

C. TAGCTA - this is not a substitution, but is the complementary DNA sequence

D. ATGGAT - this is a substitution, the C in the original sequence has been replaced (substituted) by a G.

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4 years ago

Which tool is used to measure an objects mass??

Vesna [10]

A Balance tool is what you need

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4 years ago

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Which organisms transform nitrogen to a form that is useful to plants

Katen [24]

The answer is nitrogen-fixing bacteria.

Plants are not able to directly use atmospheric nitrogen. It must be converted into different form through a nitrogen cycle. In the process of nitrogen fixation, nitrogen fixing bacteria converts atmospheric nitrogen into ammonium. In the process of assimilation, plants incorporate ammonium into proteins.

Some legumes have a symbiotic relationship with bacteria that live in their root system. These bacteria are called Rhizobia and have the ability of nitrogen-fixation.

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3 years ago

Read 2 more answers

A true-breeding plant with inflated pods and yellow pods is crossed with a plant that has constricted and yellow pods. Draw a

xenn [34]

Answer: Sysy × Sysy i.e. all are genotypically heterozygous, inflated, and yellow

Explanation:

Punnett squares are a diagrammatic means of determining traits of hybrid offspring produced via crosses in genetic breeding. The parental genotypes and phenotypes are usually known, and these typically follow standard Mendelian ratios and inheritance.

Mendelian genetics focus on trait inheritance, or heritability. These traits are packaged out into its own gamete, inherited by themselves and often show dominance, where one's effect may mask those of another trait.

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

For this cross...

Parent generation or P generation:

gametes: Y → pod color green dominant (Y), yellow recessive (y)

S→ pod size; inflated dominant (S), constricted recessive (c)

Assumptions...

True breeding plants are homozygous, with identical sets of alleles
The other parent is heterozygous, as it was not said to breed true

P generation: SySy × sysy

yellow, inflated × yellow, constricted

F1 generation: Sysy × Sysy ...(from punnet square)

phenotype: yellow, inflated × yellow, inflated

∴ all are genotypically heterozygous, inflated, and yellow

7 0

3 years ago