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Dennis_Churaev [7]
3 years ago
9

Which of these is the correct sequence of events leading to evolution?

Biology
1 answer:
xenn [34]3 years ago
5 0
Variation in species --> natural selection --> differential reproduction --> heredity --> evolution
hope it helps

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The level of __________ in the blood is the secondary stimulus for respiration
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The level of oxygen in the blood is the secondary stimulus
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Explanation:

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Dizygotic twins: a. are also called "identical" twins. b. develop from the same fertilized egg. c. are as genetically similar as
posledela

Answer:

The correct answer is c. are as genetically similar as other siblings.

Explanation:

Dizygotic twin are the twins which developes from two different fertilized egg. So a dizygotic twins can be both male, both female or one male and one female. As dizygotic twins are produced by fertilization of two different gametes, therefore, they share just half of their gene like other siblings share.

Therefore dizygotic twins are as genetically similar as other siblings. Monozygotic twins are the twins that are produced from a single fertilized egg which splits into two eggs. So monozygotic twins share 100% gene, therefore, they are called identical twins. So the correct answer is c.

8 0
3 years ago
I need help with the image (phenotypes and genotypes).
Flauer [41]

Answer:

See the answer below

Explanation:

1. <u>Only one phenotype</u> is present in the F1 generation offspring. Since tallness was dominant over shortness, all the offspring in the F1 generation appeared tall.

2. <u>Two phenotypes </u>are present in the F2 generation - 9 tall and 3 short. The short trait reappeared at the F2 generation.

3. The genotype of the F1 offspring would be heterozygous. Assuming the purebred tall is AA and the purebred short is aa:

     AA   x   aa

  Aa   Aa   Aa   Aa

All the F1 offspring will appear tall and their genotypes would be heterozygous.

4. Assuming that the allele for height is denoted with A (a), <u>the genotype of the purebred tall plant would be AA. </u>

5. In a similia vein, <u>the genotype of the purebred short plant would be aa. </u>

5 0
3 years ago
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