You have discovered a new unusual species with very large amounts of yolk compared to related species. What do you expect might be different about its cleavage pattern?Multiple ChoiceCleavage is likely to be meroblastic instead of holoblastic.Cleavage is likely to be holoblastic instead of meroblastic.Cleavage is likely to be trophoblastic instead of meroblastic.Cleavage is likely to be holoblastic instead of trophoblastic.
Question
You have discovered a new unusual species with very large amounts of yolk compared to related species. What do you expect might be different about its cleavage pattern?Multiple ChoiceCleavage is likely to be meroblastic instead of holoblastic.Cleavage is likely to be holoblastic instead of meroblastic.Cleavage is likely to be trophoblastic instead of meroblastic.Cleavage is likely to be holoblastic instead of trophoblastic.
Solution
Cleavage is likely to be meroblastic instead of holoblastic.
Explanation: In embryology, cleavage is the division of cells in the early embryo. The zygotes of many species undergo rapid cell cycles with no significant growth, producing a cluster of cells the same size as the original zygote. The different cells derived from cleavage are called blastomeres.
There are two types of cleavage: holoblastic (total) and meroblastic (partial). Holoblastic cleavage occurs in animals with little yolk in their eggs, such as humans and other mammals. Meroblastic cleavage occurs in species with yolk-rich eggs, such as birds and reptiles.
Since the newly discovered species has a large amount of yolk in its eggs compared to related species, it is likely that its cleavage pattern is meroblastic instead of holoblastic. This is because the large amount of yolk, which is nutrient-rich but relatively inert, can impede cell division, leading to incomplete division of the egg, or meroblastic cleavage.
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