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sammy [17]
3 years ago
15

Pedigrees are used to help geneticists understand how traits are inherited between generations. The Romanovs, a Russian royal fa

mily, had a history of hemophilia, a sex-linked disorder that is determined by a recessive allele on the X chromosome.

Biology
2 answers:
svet-max [94.6K]3 years ago
6 0
The question is the following :
<span>What is the best evidence to prove that Irene was heterozygous for hemophilia?
A) Alice carried the recessive allele.
B) Alexandra carried the recessive allele.
C) Frederick carried the recessive allele.
D) Waldemar carried the recessive allele.


The correct answer is A

In the pedigree, marked with blue are the carriers of the X recessive allele ( they have one X that has the mutation and the other that doesn't).
Alice was Irene's' mother, and since both Alice and iIrene have the allele, it is safe to conclude that Irene inherited the recessive allele from Alice.</span>

Sliva [168]3 years ago
4 0

Answer:

the answer is option A

Explanation:

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Which of these characteristics is shared by algae and seed plants? Which of these characteristics is shared by algae and seed pl
Tomtit [17]

Answer:

the correct answer is: chloroplasts

Explanation:

Chloroplasts are the cellular organelles that in photosynthetic eukaryotic organisms take care of photosynthesis.

The characteristic shared by both algae and seed plants is the presence of chloroplasts. Algae and seed plants both have chloroplasts.

5 0
3 years ago
What term designates foods that contain nonnutrient substances that may provide health benefits beyond basic nutrition?​ ​functi
SashulF [63]
The term that designates foods that contain non nutrient substances that may provide health benefits beyond basic nutrition is functional foods. Functional foods are modified food that claims to improve health or well-being by providing benefit beyond that the traditional nutrients it contains. They include; breads, cereals, beverages that are fortified with vitamins, some herbs, and nutraceuticals. 
7 0
3 years ago
Adult tickets for the school musical sold for $3.50 and student tickets sold for $2.50. On a given night, 321 tickets were sold
nalin [4]

Answer:

total amount spent on student ticket = 186($2.5)=$465.00,

Total amount spent on adult tickets = 135($3.5)=$472.50

Explanation:

cost total = student ticket price (x) + adult ticket price (321 - x)

$937.50 = (2.5)(x) + (3.5)(321 - x)

$937.50 = 2.5x + 1123.5 - 3.5x

x = 186, therefore 186 student tickets sold,  

(321-x) = 321-186 = 135, therefore 135 adult tickets were sold.

total amount spent on student ticket = 186($2.5)=$465.00,

Total amount spent on adult tickets = 135($3.5)=$472.50

So the total amount spent on tickets was  

$472.50 + $465.00 = $937.50

8 0
2 years ago
What was the purpose of adding methotrexate to the cells expressing a genetically-engineered Dihydrofolate Reductase enzyme in t
ira [324]

Answer:

Methotrexate inhibits the synthesis of DNA, RNA, and protein synthesis of the cells in the experiment.

Explanation:

Methotrexate competitively inhibits the enzyme dihydrofolate reductase (DHFR) which is involved in the synthesis of tetrahydrofolate from the inactive dihydrofolate. The methotrexate blocks the enzyme by binding to its active site thereby preventing further reaction of the dihydrofolate reductase enzyme and dihydrofolate. Tetrahydrofolate is a useful material for the de novo synthesis of thymidine, a nucleoside. And without thymidine, DNA synthesis is hindered. Methotrexate therefore inhibits the synthesis of DNA, RNA, thymidylates and of course protein synthesis.

5 0
3 years ago
If a cell has the ability to take in water, food molecule, and other necessary materials this indicates it is cabable of
mojhsa [17]

Answer: If a cell has the ability to take in water, food molecule,  and other necessary materials this indicates it is capable of  nutrition. The answer can not be digestion or absorption because it's a term that talks about multicellular beings.

6 0
3 years ago
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