An elephant has 56 chromosomes. Which statement about a zygote of an elephant is true?

2 answers:

7 0

You divide the number of chromosomes in half, just like humans. So the female zygote has 28 chromosomes and the male sperm have 28 chromosomes. This way each set of chromosomes contributes the same amount to each sex cell.

katrin [286]3 years ago

5 0

The right answer is The zygote has 56 chromosomes, 28 inherited from the mother and 28 from the father.

In diploid organisms such as mammals, each individual has two copies of each gene, one from the mother and the other from the father (exception: sex chromosome genes). If these two versions are identical, the individual is said to be homozygous for the gene considered. In the opposite case, it has two different versions (two different alleles), and it is heterozygous for this gene.

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Endocrine cells

Lemur [1.5K]

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8 0

3 years ago

Read 2 more answers

The net energy yield from this pathway, where glucose is broken down through several steps forming pyruvate, is ________ molecul

stepan [7]

Answer:

2 molecules of ATP and 2 molecules of NADH

Explanation:

Glycolysis is the first step of cellular respiration (break down of glucose to extract energy) which occurs in the cytoplasm. Glycolysis is a pathway common to all living organisms- prokaryotes and eukaryotes, as it does not require oxygen to occur.

Glycolysis occurs in two major phases (ten steps) requiring 10 enzymes catalyzing each step; the energy-requiring phase and the energy-requiring phase.

In the energy-requiring phase, the starting molecule (glucose) gets rearranged in a series of chemical reactions, and two phosphate groups gets attached to it producing fructose-1,6-bisphosphate which is unstable, This modified sugar then splits in half due to its instability to form two different but inter-convertible phosphate-bearing three-carbon sugars (Dihydroxyacetonephosphate, DHAP and Glyceraldehyde-3-phosphate, G3P). Because the phosphates used in these steps come from 2 ATP molecules, 2 ATP molecules get used up in this phase

All the DHAP molecules get converted to G-3-P in order to enter the next phase.

In the energy-recovering phase, the 3-carbon sugar (G3P) is converted into another three-carbon molecule called pyruvate, through a series of reactions. In these reactions, two ATP and 1 NADH molecules are made. This recovery phase occurs twice (one for each of the two isomeric three-carbon sugars, DHAP and G3P). Hence, a total of 4 ATP and 2 NADH molecules are produced in this phase.

Overall, Glycolysis converts one glucose (six-carbon) molecule to two pyruvate (three-carbon) molecules and a net release of 2 ATP molecules (4 overall - 2 used) and 2 NADH molecules.