The answer is D.
Homo naledi seems most likely to be a member of the genus Homo; however, its small brain size is regarded as a primitive hominin trait more reminiscent of australopithecus.
Homo naledi is an extinct species of hominin, which anthropologists first described in September 2015 and have assigned to the genus Homo.
Answer:
Option B
Explanation:
The series of events mentioned in this description are as follows -
a) In 1850, ash layer deposits over the layer of red clay
b) In 1902, layer of silt from tsunami covers the ash
Now pot is found in between ash and red clay layer
While coin is found in between ash and silt.
Thus, it is clear that pot was first buried between the ash and red clay layer. While coin was buried in 1902 above the ash layer but beneath the silt layer.
Hence, option B is correct
A. direct B. indirect C. direct D. indirect
Competition occurs by direct and indirect means. Organisms interact directly by fighting (aggression) for scarce resources. Two eagles fighting over the salmon carcass and two colonies of ant clashing over a wasp are samples of aggression (direct competition)
Indirect competition happens when there is a common or limited <span>supply of at least one resource (food, water, and territory). </span>Use of this resource lessens and later depletes the amount available to others, or they compete for space.<span> Gray foxes preying on penguins and squirrels relying on nuts for food are samples of indirect competition.</span>
Complete question:
A completely-plated stickleback from a marine population was mated to a low-plated stickleback from a freshwater population. The resulting F1 hybrids all displayed a completely plated phenotype. When the F1 hybrids were allowed to interbreed, the resulting F2 generation included completely plated offspring and low-plated offspring in an approximate 3:1 ratio. Which of the following conclusions is best supported by the results of the breeding experiments?
(A) Phenotypic variation in the F sub two generation suggests that armor morphology is controlled by many alleles of a single gene.
(B) The completely-plated phenotype is controlled by a dominant allele of a single gene.
(C) Armor loss is an acquired characteristic that is affected by one or more environmental factors.
(D) Patterns of armor plating in stickleback populations are regulated by sex-specific signals.
Answer:
(B) The completely-plated phenotype is controlled by a dominant allele of a single gene.
Explanation:
In the given genetic cross, all the F1 progeny expressed a "completely plated" phenotype. This means that this phenotype is dominant. Interbreeding of F1 hybrids obtained the "completely plated" and "low plated" progeny in a 3: 1 ratio. This means that both these phenotypes are controlled by two alleles of a gene.
The F1 hybrids were heterozygous dominant for the trait and carried both recessive and dominant alleles of the gene. Segregation of these alleles during gamete formation formed 50% alleles with the dominant allele and rest 50% with the recessive allele. The random fusion of these gametes gave the F2 progeny in 3 dominant: 1 recessive ratio.
