BIOLOGY COLLEGE

Chromosome iv in drosophila is a very small chromosome and carries a tiny amount of genetic material. fruit flies that are trisomic for chromosome iv have no apparent phenotypic abnormalities, and they retain their fertility. among the genes on chromosome iv is one for which a recessive allele ey produces the "eyeless" phenotype. a male that is trisomic for chromosome iv and has the genotype + + ey is crossed to a diploid eyeless female with the genotype eyey.

Answers

Answer 1
Answer: If I assume that random segregation of chromosomes takes place during spermatogenesis and all sperms are viable then I will take the male through meiosis.
The three chromosomes are +, +, ey
Then you double them into sister chromatids which is ++, ++, eyes.
If I consider all possible alignments during metaphase as, the three homologous pairs and gather at the metaphase plate.
Remember that any two of the three pairs will join together and odd pair out will line up at the metaphase plate with no partner pair.
There are three different arrangements which are possible for the three homologous pairs. 
Two of the three possible arrangements will segregate and make two sperm with +ey and two sperm with +. The other arrangement will segregate and make two sperm with ++ and two sperm with ey.
When meiosis is being done, then the sperm genotypes and their proportions are, 
1/3+ey, 1/3+, 1/6++, 1/6ey 

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Answers

Explanation:

it is through the placenta.

italsoprotectstheembryofromharmfulsubstances
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Answers

Answer:

Glycolysis

Explanation:

Glycolysis is the first step of cellular respiration, where glucose is turned into 2 pyruvate molecules.

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Answers

Answer:

Galactose

Explanation:

Galactose is a sugar with six carbons and one aldehyde group present at the end. The presence of a free aldehyde group in galactose makes it a reducing sugar. Galactose can reduce the Cu2+ of Benedict solution into Cu+ and produce a red precipitate.  Sorbitol, β-ethylglucoside, and gluconate do not have aldehyde group to reduce Cu2+ ions and therefore, do not give the positive test with Benedict solution.

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C) ATP and NADPH produced by the light reactions are used by the Calvin cycle to make carbohydrates
D) The Calvin cycle breaks down carbohydrates into simpler molecules

Answers

Answer:

C) ATP and NADPH produced by the light reactions are used by the Calvin cycle to make carbohydrates

Explanation:

The light-dependent reactions of photosynthesis form ATP and NADPH. These reactions occur in the thylakoid membrane of chloroplasts.

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Answers

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Answer:

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Explanation:

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Answers

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