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Novay_Z [31]
3 years ago
13

Experimental support for Mendel's law of segregation comes from the results of self-fertilizing F2 plants that display the domin

ant phenotype. Based on the law of segregation, what proportion of the dominant F2 plants would be expected to produce F3 progeny phenotypes in a ratio of 3 dominant : 1 recessive?
Biology
1 answer:
Tom [10]3 years ago
3 0

Answer:

2/3

Explanation:

When two heterozygous plants (let's suppose Tt and Tt) are crossed, the progeny exhibits dominant and recessive phenotype in a 3 : 1 ratio respectively. This occurs since T and t alleles present together in the heterozygous parent plant segregate from each other and are distributed to the different gametes.  

Cross Tt x Tt= 1/4 TT: 1/2 Tt: 1/4 tt

Considering the genotype of the F2 progeny, there is 2/3 heterozygous dominant progeny (Tt) out of a total of 3/4 dominant progeny. This heterozygous dominant progeny would give a 3:1 ratio of dominant and recessive progeny upon self-fertilization.

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Which of the following statements is/are true of corals?
iogann1982 [59]

Answer:

The correct answers are option A. "Corals are animals".  B. "Corals are benthic organisms"., and E. "Corals live in tropical water".

Explanation:

Corals are animals, what we know as a coral, is in fact a group of small animals called polyps that need food to survive. Corals are benthic organisms because they live at the bottom of the sea. The subclass of benthic organisms that corals belong is called Macrobenthos, for being large enough to be seen at the naked eye. Corals live mostly in tropical waters, because they do not tolerate waters with a temperature below 18 Celsius.

7 0
3 years ago
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Species a diverged from species b 60,000 years ago. On a particular gene, they have 15 nucleotide differences. How many nucleoti
a_sh-v [17]

The given question says that b species diverged around 60,000 year ago from species a. Since the divergence, they have a nucleotide difference of 15 nucleotide.

We need to find out the nucleotide difference in another 240,000 year, which means a total of 300,000 year since divergence.

The nucleotide difference in 60,000 years = 15 nucleotide.

The nucleotide difference in 1 year =\frac{15}{60,000}  nucleotide.

The nucleotide difference in 300,000 years = \frac{15}{60,000}\times 300,000 nucleotide.

The nucleotide difference in 300,000 years = 75 nucleotide.

Hence, after another 240,000 years or 300,000 years since divergence, the species and species b would show a difference of 75 nucleotide.

In another 240,000 years, there would be 60 nucleotide difference, as 15 of the nucleotide are already different in initial 60,000 years from the total of 75 nucleotide difference in 300,000 years. So, 60 (75-15) nucleotide difference would be observed in next 240,000 years.


4 0
3 years ago
A challenge to traditional (pre-1860) ideas about species came from embryology, when it was discovered that _____. see concept 2
timofeeve [1]
A challenge to traditional (pre-1860) ideas about species came from embryology, when it was discovered that embryos of dissimilar organisms, such as sharks and humans, resemble each other. Embryology involves the study of the formation and the development of an embryo and the fetus. It is one type of evidence of evolution such that the embryos of many different kinds of animals, mammals, reptiles, birds, fish among others, are similar showing a common ancestry. 
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Free_Kalibri [48]
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Hope this helps :)
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Mention four major materials used in collecting animals and their uses​
4vir4ik [10]

Answer:

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