Answer:
B. It is the kind of evolution that can change the relative abundance of a particular allele in a gene pool over the course of generations.
Explanation:
Microevolution small changes in allele frequency in a population.<em> Its effects can be seen in short periods, even from one generation to the next one generation, when these microevolution changes accumulate they can lead to macroevolution.</em>
The processes that result in microevolution are
- Gene Flow: Is the transfer of variations of a gene from one population to another, generally of the same species.
- Mutation: A random alteration of a gene, occurs rarely and it's the source of new alleles. They can benefit or be harmful.
- Genetic drift: <em>Its the random possibility of an allele to become less or more numerous in a population</em>, this can lead to the fixation or loss of this allele.
- Selection: It depends on the adaptative advantage of certain traits
I hope you find this information useful and interesting! Good luck!
The hypothalamus synthesizes and secretes certain hormones called releasing hormones which stimulate the secretion of pituitary hormones.
The hypothalamus gland uses the nervous system and secretes hormones which sends messages to the pituitary hormones.
The eurkaryotes which has a similar mode of nutriion is Amoeba.
Amoeba is a unicellular eukaryotes. It eats microscopic organisms. When it sights a food substance, it surrounds the food substance with its food vacuole and enclose it inside the food vacuole where the food particle will be digested. The nutrients in the food will move into the cell and amoeba will excrete the waste using contractile vacuole.<span />
Answer:
you expect to see that 75% of your F2 generation rabbits have floppy ears and 25% of your rabbits have black fur.
Explanation:
<u> Available data:</u>
- Two true-breeding groups of rabbits.
- The first group has floppy ears and white fur.
- The second group has straight ears and black fur.
- 100% of the F1 generation has floppy ears and gray fur.
- Each of these traits is determined by a single gene and undergo independent assortment.
Having this information we can infer that floppy years, expressed by F allele, might be dominant over straight ears, expressed by f allele. And that the fur color is affected by incomplete dominance, being B the allele expressing black color, b the allele expressing white color and Bb the genotype for grey color.
Incomplete dominance is a condition where neither of the alleles completely dominates over the other one. Descendents possess an intermediate phenotype between the two parental phenotypes and not the dominant one.
Cross between groups
Parental) FFbb x ffBB
F1) FfBb
<u>Cross for the ear traits:</u>
Parental) Ff x Ff
Gametes) F f F f
Punnet square) F f
F FF Ff
f Ff ff
F2) 75% of the progeny have floppy ears, FF and Ff
25% of the progeny have straight ears, ff
<u>Cross for the fur color traits</u>:
Parental) Bb x Bb
Gametes) B b B b
Punnet Square) B b
B BB Bb
b Bb bb
F2) 25% of the progeny have black fur, BB
50% of the progeny have grey fur, Bb
25% of the progeny have white fur, bb
The part of the brain that is being <span>tested when a police officer asks a DWI suspect to walk a straight line and touch his nose with his finger is the primary motor cortex.
The motor cortex has to do with movement and balance - so obviously, if you need to prove that you can walk a straight line, which involves both of these things, or if you need to move your finger to a certain spot, which also involves both balance and movement, that would be the correct answer.
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