Answer:
B) There is an increase in the number of giraffes with long necks in areas of Africa where low-growing trees have died
Explanation:
The directional selection is one of the ways of the natural selection in which the natural selection selects or favours the most extreme trait of the species and the extreme trait show higher fitness than the normal or average trait.
In the given question, the case of Giraffe necks shows directional selection as the normal length of the neck is not favoured by the environment but the extreme trait that is long neck is favoured by the environment and the selection shifted to that level.
Thus, Option-B is the correct answer.
Plates at our planet's surface move because of the intense heat in the earth's core that causes molten rock in the mantel layer to move.It moves in a pattern called a convection cell forms when warm material rises,cools,and eventually sink down.
Answer:
RrYy is the genotype that is heterozygous for both seed shape and seed color. The traits here we are discussing are pea plant's seed color and shape.
Explanation:
A dihybrid cross is a cross in which two traits are simultaneously being studied. Here there are two traits under consideration that are seed shape and seed color. The seed shape can be round or wrinkled and seed color can be yellow or green. The round seed allele is dominant over yellow seed allele and the yellow color allele is dominant over green color allele.
As homozygous indicate both alleles of a gene are same in an individual and heterozygous condition indicates that both alleles of a gene in an organism are different.
Therefore the genotype of homozygous pea plants for seed color and seed shape can be RRYY or rryy respectively and genotype of heterozygous genotype will be RrYy respectively.
Hope it helps!
"A plants vascular system is made up of specialized cells that for straw-like tubes" is the one among the following that <span>allows a plant's vascular system to work as a transport system. The correct option among all the options that are given in the question is the third option or option "C". I hope it helps you. </span>
Explanation:
Prophase - <em>Pairs of chromosomes separate and move to opposite ends of the cell.</em>
Metaphase <em>-Each pair of chromosomes lines up along the middle of cell.</em>
Anaphase <em>- Each chromosome moves towards, and pairs up with its mate.</em>
Telophase <em>- The nuclear membrane forms around the chromosomes. </em>
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<u><em>Hope this helps!</em></u>
<u><em>Please mark brainliest! </em></u>
