28) Which describes the ABO blood group system? A) Incomplete dominance B) Multi

Question

28) Which describes the ABO blood group system? A) Incomplete dominance B) Multiple alleles C) Pleiotropy D) Epistasis E) Mutation 29) A woman has six sons. The chance that her next child will be a daughter is 30) In certain plants, tall is dominant to short. If a heterozygous plant is crossed with a homozygous tall plant, what is the probability that the offspring will be short? 31) The somatic cells derived from a single-celled zygote divide by which process? 32) The sexual life cycle increase the genetic variation in a species by When a disease is said to have a multifactorial basis, it means that 34) Besides the ability of some cancer cells to over-proliferate, what else could logically result in a tumor? A) metastasis B) changes in the order of cell cycle stages C) lack of appropriate cell death D) inability to form spindles D) inability of chromosomes to meet at the metaphase plate 35 One difference between cancer cells and normal cells is that cancer cells A) are unable to synthesize DNA. B) are arrested at the S phase of the cell cycle. C) cannot function properly because they are affected by density-dependent inhibition. D) are always in the M phase of the cell cycle. E) continue to divide even when they are tightly packed together

Explanation / Answer

28. B. Multiple alleles.

There are three alleles that confer blood type - IA, IB, IO.

29. 50%.

The chance of having a boy or girl is always 50%.

30. There is 0% probability, that the offspring will be short.

Let 'T" be the dominant allele and 't' be the recessive allele.

Tt x TT

Punnett square analysis -

31. Mitosis.

A zygote divides by mitosis to give rise to identical somatic cells.

T t T TT (tall plant) Tt (tall plant) T TT (tall plant) Tt (tall plant)

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