Could someone help me with these fast

What did Charles Darwin conclude during his visit to the Galapagos islands?

harina [27]

Darwin finally consolidated all of his observations into his famous book On The Origin of Species, drastically and controversially altering the scientific view on the biological origins of life. I learned this a little while ago in my school, I kept notes!! Hope this helps!! <3

3 0

2 years ago

Explain how the discoveries by Rosalind Franklin helped Watson and Crick build an accurate model of DNA.

Andru [333]

Answer:

Rosalind's x-ray showed that the ladders of nucleotides were inside a double helix.

Watson and Crick built models with the ladders on the outside.

4 0

3 years ago

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How many amino acids are coded for by the strand of mRNA shown below? Assume the reading frame begins with the first nucleotide.

Andrej [43]

Answer:

2 ..........................

4 0

3 years ago

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Fill in the blanks.Asher wishes to apply the FITT principles to create a cardiorespiratory fitness program. He first must determ

Rus_ich [418]

Answer:

Fill in the blanks.Asher wishes to apply the FITT principles to create a cardiorespiratory fitness program. He first must determine the frequency of his workouts. Asher learns that the American College of Sports Medicine (ACSM) recommends spending 3 to 5 days per week on cardiorespiratory conditioning. He understands that the intensity level he chooses will also affect the number of days per week he will work out. Asher is currently not very fit and does not like to work out at high-intensity levels, so he chooses to work out at moderate-intensity levels. According to the ACSM, lower-intensity levels require workout frequency to be more than 3 days per week with 5 days per week recommended. Asher determines that he will measure his workout intensity by counting the number of heart beats for 10 seconds and then multiply by six to convert to the number of beats per minute to determine his heart rate .Using the ACSM's training guidelines, Asher reads that moderate intensity indicates that his heart rate range should be at 64 to 75% of his heart rate maximum. He also understands that if he uses the talk test to measure his moderate intensity level, he should be able to speak in brief sentences and words. Asher decides that for optimal cardiorespiratory conditioning at moderate intensity his exercise time should be minutes in duration. After determining the exercise frequency, intensity, and time, Asher is now left to determine exercise type .Through reading, he learns that for optimal motivation, training improvements, and injury prevention , he should choose activities that he enjoys.

7 0

3 years ago

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Michelle was curious about her mother's blood type. Michelle knew that her own blood type was o,

babymother [125]

Blood type is determined by the I gene. IAIA and IAi determines A blood type. IBIB and IBi determines B blood type. ii determines 0 blood type. Michelle's mother must at least carry one recessive allele i.

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The blood type is determined by a gene, which is triallelic.

IA dominant over i. The person presents A type of antigens.

IB dominant over i. The person presents B type of antigens.

IA and IB are codominant. The person presents both types of antigens, A and B.

i is the recessive allele. The person does not present any antigen.

⇒ H0m0zyg0us dominant individuals IAIA, or heter0zyg0us Individuals IAi, will express the A blood type.

⇒ H0m0zyg0us dominant individuals IBIB, or heter0zyg0us Individuals IBi, will express the B blood type.

⇒ Individuals with h0m0zyg0us recessive genotype, ii will express the 0 blood type.

⇒ Individuals carrying IA and IB alleles will express the AB blood type.

To solve the problem, we will use this information.

We know that

Michelle is blood type 0

Father is blood type A

Brother and sister are blood type A

Mother??

⇒ If Michelle is blood type 0, then her genotype is ii. She must have received one recessive allele from her father and one from her mother.

⇒ This suggests that Michelle's father, who is blood type A, is heter0zyg0us IAi. He must have at least one dominant allele IA that determines his phenotype, and one i allele.

⇒ Michelle's brother and sisters are also type A. They might be either h0m0zyg0us dominant IAIA or heter0zyg0us IAi.

⇒ Michelle's mother should have at least one recessive allele i. She could be either IAi or IBi, or ii. There are three possible option for her genotype.

Let us make the Punnet squares to understand it better. We know the genotype of the father, but there are three options for the mother.

Option 1

Cross) father x mother

Parentals) IAi x IAi

Gametes) IA i IA i

Punnett square) IA i

IA IAIA IAi

i IAi ii

F1) 25% of the progeny is expected to be h0m0zyg0us dominant IAIA

50% of the progeny is expected to be heter0zygus IAi

25% of the progeny is expected to be h0m0zyg0us recessive ii

75% of the progeny is expected to be blood type A ⇒ IAIA and IAi ⇒ Sisters and brother

25% of the progeny is expected to be blood tye 0 ⇒ ii ⇒ Michelle

Option 2

Cross) father x mother

Parentals) IAi x IBi

Gametes) IA i IB i

Punnett square) IA i

IB IBIA IBi

i IAi ii

F1) 25% of the progeny is expected to be IAIB

25% of the progeny is expected to be heter0zygus IAi

25% of the progeny is expected to be heter0zygus IBi

25% of the progeny is expected to be h0m0zyg0us recessive ii

25% of the progeny is expected to be blood type AB ⇒ IAIB

25% of the progeny is expected to be blood type A ⇒ IAi ⇒ Sisters and brother

25% of the progeny is expected to be blood type B ⇒ IBi

25% of the progeny is expected to be blood tye 0 ⇒ ii ⇒ Michelle

Option 3

Cross) father x mother

Parentals) IAi x ii

Gametes) IA i i i

Punnett square) IA i

i IAi ii

F1) 50% of the progeny is expected to be heter0zygus IAi

25% of the progeny is expected to be h0m0zyg0us recessive ii

50% of the progeny is expected to be blood type A ⇒ IAi ⇒ Sisters and brother

50% of the progeny is expected to be blood tye 0 ⇒ ii ⇒ Michelle

Despite the fact we can not determine for sure the mother's genotype, we know that she carries at least one recessive allele, which is why Michelle's blood type is 0.

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8 0

2 years ago