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EleoNora [17]
3 years ago
9

The modern synthesis refers to a. the combination of Mendelian and blending inheritance. b. the combination of modern genetics a

nd Darwinism. c. the combination of modern anthropology with animal behavior. d. the combination of anthropology and biology
Biology
2 answers:
Kitty [74]3 years ago
8 0

Answer:

The correct answer is  b. the combination of modern genetics and Darwinism.

Explanation:

Modern synthesis is the experimental and theoretical work that was made by combining the work of two scientist Charles darwin and George Mendel. This term was coined in a book called Evolution: The Modern Synthesis.

New definition of evolution was proposed by it which was focused on the genetic basis of evolution for example allele frequency changes in the population. Gene flow, mutation pressure,  natural selection, and random genetic drift were taken as the cause of evolution. So the correct answer is b.

Ad libitum [116K]3 years ago
4 0

Answer:

B. the combination of modern genetics and Darwinism.

Explanation:

The modern synthesis refers to the concept which combined the theory of inheritance by Mendel and theory of evolution by Charles Darwin. The theory also used the concept of Theory of germplasm.

The modern synthesis concept came in the early 20th century when the studies were going on Mendel's theory and the evolutionary aspects.  The concept led to the formation of new concepts like the macroevolution, microevolution and the evolution affected by mutation of genes.

Thus, Option-B is correct.

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A geneticist crossed fruit flies to determine the phenotypic ratio. The geneticist crossed a fly with blistery wings and spinele
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Complete question:

A geneticist crossed fruit flies to determine the phenotypic ratio. The geneticist crossed a fly with blistery wings and spineless bristles (bbss) with a heterozygous fly that had normal wings and normal bristles (BbSs). Which proportion of offspring that are dominant for both traits in would you not expect based on Mendel's law of independent assortment? 1/2 , 4/16, 25% , or 1/4

Answer:

1/2 is the proportion of the offspring that is NOT expected among individuals that are dominant for both traits.

4/16 = 1/4 = 25% of the progeny and the correct expected proportion of individuals that are dominant for both traits.

Explanation:

<u>Available data</u>:

  • Cross:  a fly with blistery wings and spineless bristles with a heterozygous fly that had normal wings and normal bristles
  • Recessive trait: blistery wings and spineless bristles
  • Dominant trait: normal wings and normal bristles

Let us say that:

  • B is the dominant allele for normal wings
  • b is the recessive allele for blistery wings
  • S is the dominant allele for normal bristles
  • s is the recessive allele for spineless bristles

Parentals)        bbss       x        BbSs

Gametes)  bs, bs, bs, bs     BS, Bs, bS, bs

Punnett square)    BS        Bs         bS        bs

                     bs    BbSs    Bbss     bbSs    bbss

                     bs    BbSs    Bbss     bbSs    bbss

                     bs    BbSs    Bbss     bbSs    bbss

                     bs    BbSs    Bbss     bbSs    bbss

F1)  4/16 = 1/4 = 25%  of the progeny is expected to be BbSs, dyhibrid individuals, expressing normal wings and normal bristles

     4/16 = 1/4 = 25% of the progeny is expected to be Bbss, expressing normal wings and spineless bristles

     4/16 = 1/4 = 25% of the progeny is expected to be bbSs, expressing  blistery wings and normal bristles

     4/16 = 1/4 = 25% of the progeny is expected to be bbss, expressing  blistery wings and spineless bristles    

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