Genetics Questions

A heterozygote contains two different alleles of the same gene. Just before meiosis begins the two different alleles are found on:A. A pair of sister chromatidsB. Two different, non-homologous chromosomesC. a pair of homologous chromosomesD. any of these answers could be correct

Flower color in snapdragons is due to a gene with incomplete dominance: CRCR plants have red flowers, CRCW have pink flowers, and CWCW plants have white flowers. Which cross is expected to yield progeny with flower colors in a ratio of 1 red:1 pink?A. CRCR × CWCWB. CRCR × CRCWC. CRCW × CRCWD. CWCW × CWCWE. CRCW ×CWCW

T / F : The X chromosome is unlike the autosomes in that the X chromosome in an XY always comes from the XY Parent

The genetic makeup of a particular individual is its:A. dominance.B. heterozygosity.C. genotype.D. phenotype.E. filialicity.

You decide to compare the genes and DNA sequence of a certain chromosome to those of two other chromosomes: a chromosome homologous to the chromosome in question and a chromosome nonhomologous to it. What do you predict you will observe?A. The nonhomolog has different genes but a similar (not identical) DNA sequence.B. The chromosome's homolog has the same genes but in a different order.C. The chromosome's homolog has the same genes and an identical DNA sequence.D. The chromosome's homolog has the same genes and a similar (not identical) DNA sequence.E. The nonhomolog has the same genes but in a different order.

We have a pea plant that is heterozygous for two traits - height and seed color. The plant is tall and yellow, which are dominant phenotypes; short and green are recessive phenotypes.We will let this plant self-fertilize, and see what kind of offspring this plant produces. This is a dihybrid cross; we are tracking two traits - T (tall) to denote height and Y (yellow) to denote seed color. The plant is heterozygous for both traits so the plant is TtYy.What type of gametes will a TtYy plant produce? Commas in the answers separate types of gametes. TY, Ty, tY, tyDraw out a Punnett square for the dihybrid cross: TtYy x TtYyDetermine the ratio of the following phenotypes:tall and yellow: short and yellow: tall and green; short and green = 9:3:3:1

Where does splicing of pre-mRNA to make mature mRNA occur?A. In the cytoplasmB. In the endoplasmic reticulumC. In the nucleusD. In the mitochondrial matrixE. In both the nucleus and in the stroma of the Golgi

For which processes are the following used?Promoter

In analyzing the number of different bases in a single-stranded messenger RNA, which rule is correct?A. None of the other answers are correct.B. A + U = G + CC. A = GD. A + G = C + UE. A + T = C + U

You examine the chromosomes of a somatic cell in G2 from a diploid animal in which 2n = 10. Which of the following is NOT true about the chromosomes in this cell?A. There are 10 chromosomes presentB. There are 20 molecules of DNA presentC. There are 20 chromosomes presentD. All of the chromosomes contain double-stranded DNA

Meiosis I separates ________________, and meiosis II separates __________________A. sister chromatids, sister chromatidsB. homologous chromosomes, homologous chromosomesC. sister chromatids, homologous chromosomesD. homologous chromosomes, sister chromatids

T/F A human cell has more DNA molecules during metaphase of meiosis I than during metaphase of mitosis.

T/F A eukaryotic chromosome has only one origin of replication.

The role of snRNA is to:A. help splice out introns from DNA.B. shuttle mRNA through the nuclear membranes.C. carry protein-coding information from the nucleus to the ribosome.D. form the structural backbone of the ribosome.E. act as an adaptor, matching specific amino acids to specific codons in the mRNA.

Why does DNA replication require the enzyme primase?A. Primase builds a DNA primer to stabilize the replication fork.B. Primase builds an RNA primer so that DNA polymerase has a free 3' end to attach nucleotides to.C. Primase builds an RNA primer to stabilize the replication fork.D. Primase builds a DNA primer so that DNA polymerase has a free 3' end to attach nucleotides to.

For which processes are the following used?Okazaki Fragments

Alternate splicing does which of the following?A. Links tRNA with a specific anticodon to a specific amino acidB. Allows partly different proteins to be translated from a single transcriptC. Does not remove any of the intronsD. Adds the poly-A tail and 5’ cap to the pre-mRNAE. Silences specific genes by blocking transcription

For which processes are the following used? RNA polymerase

The enzyme that breaks hydrogen bonds between nucleotide bases during DNA replication is:A. DNA polymeraseB. PrimaseC. HelicaseD. DNA ligaseE. Topoisomerase

Look at the picture below, showing a replicating telomere after the RNA primer has fallen off the bottom strand. On this end of the chromosome (i.e., the right), onto which strand will telomerase add nucleotides, in order to lengthen the telomere? If you've forgotten, remember that telomerase acts in the same direction as other polymerases.A. The strand that ends with the 3'B. Neither strandC. Both strandsD. The strand that ends with the 5'