Question

Question 33

Which of the following individuals will have the MOST trouble producing functional gametes during meiosis?

A. Triploid with 30 chromosomes

B. Diploid with 46 chromosomes

C. Tetraploid with 12 chromosomes

D. Tetraploid with 48 chromosomes

Question 25

Which of the following is NOT true of a cytoplasmic gene?

A. Maternal genotype affects offpring phenotype

B. It is localized in the extranuclear DNA

C. It may be located on the X chromosome

D. It may control deposition of material into oocytes

Question 29

You find a red and white (both colors on one flower) geranium in your flowerbed of red geraniums. Seeds from self fertilization of this plant produce ¼ red plants, ½ red and white plants, and ¼ white plants. When considering the visible phenotype, which explanation is most likely?

A. The red and white plant had a new mutation, creating an allele to which the wildtype red is co-dominant

B. The red and white plant had a mutation, creating an allele to which is incompletely dominant to red

C. The soil in which the red and white plant was growing is deficient in nutrients

Answer 1

33) during meiosis homologous chromosomes pair up and exchange genetic material between non-sister chromatids, in cells even the number of chromosome sets, homologous chromosomes can pair but if the number of chromosome sets is an odd number, proper chromosome pairing cannot occur.

Triploid with 30 chromosomes - there are three sets of chromosomes

Diploid with 46 chromosomes- there are two sets of chromosomes

Tetraploid with 12 chromosomes- there are four sets of chromosomes

Tetraploid with 48 chromosomes- there are four sets of chromosomes.

so the answer is a) Triploid with 30 chromosomes.

25) cytoplasmic genes are located on either mitochondrial DNA or in the chloroplast DNA, these organelles are provided by the mother to the progeny so phenotype of progeny depends on the mother, that is cytoplasmic genes are found outside the nucleus, X chromosome is found in the nucleus, so the answer is

C. It may be located on the X chromosome.