BIOL 101 Lecture Notes - Lecture 17: Epistasis, Egg Cell, Dihybrid Cross

41 views6 pages

amethystgrasshopper859

4 Apr 2016

School

Department

Biological Sciences

Course

BIOL 101

Professor

Czako

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

Heredity is the transmission of traits from one generation to the next. Variation is demonstrated by the differences in appearance that offspring show from parents and siblings. Genetics is the study of heredity and variation. Concept 1: offspring acquire genes form parents by inheriting chromosomes. Particular traits are not inherited, rather the genes that are actually inherited. Genes are the units of heredity that are made up of dna. They are passed to the next generation via gametes (sperm and egg) Humans have 46 chromosomes in their somatic cells (23 pairs) Somatic cells are al cells of the body except gametes. Locus is a genes specific location on a chromosome. Asexual reproduction is a single individual who passes all of its genes to its offspring without the fusion of gametes (produce genetically identical offspring) Clone is a group of genetically identical individuals from the same parent.

Related Questions

Which of the following statements is NOT TRUE about chromosomes?

Prokaryotes have a singel, circular chromosome

Eukaryotes have multiple, linear chromosomes.

Human cells normally 23 pairs of chromosomes.

Eukaryote chromosomes are composed of only DNA

Which of the following is NOT TRUE about reproduction?

Eukaryotes life cycles include a haploid and diploid phase.

Prokaryotes reproduce asexually.

Eukaryotes can propagate by asexual or sexual reproduction.

Prokaryotes typically reproduce slower than eukaryotes.

Which of the folllowing animal cells is most likely haploid?

nerve cell

muscle cell

sperm cell

liver cell

When human gametes fuse, they form a _____.

		Haploid egg
		Diploid zygote
		Haploid zygote
		Triploid egg

What type of daughter cells are produced during meiosis?

A. genetically distinct due to crossing over

B. genetically identical to the mother cell

C. genetically identical to each other

D. genetically aneuploids

What is NOT a benefit of asexual reproduction compared to sexual reproduction?

A. The offspring will be as successful in the habitat as the parent.

B. all members of the population can reproduce themselves

C. The only source of variation in the next generation is mutation.

D. They do not require another organism of the opposite sex.

In what phase of meiosis does Independent assortment of homologous chromosomes occur?

A. meiosis I

B. interphase

C. cytokinesis

D. meiosis II

In what phase of meiosis does Independent assortment of homologous chromosomes occur?

A. meiosis I

B. interphase

C. cytokinesis

D. meiosis II

Just to keep you in practice, a couple of the much beloved multiple multiple choiceâ¦

1. An increase in CO₂ levels in the blood directly or indirectly causes which of the following?

A) an increases in ventilation rate

B) a decrease in the pH

C) a decrease in hemogloginâs binding affinity for O₂

D) a decrease in the O₂ levels in the blood

E) an immediate increase in the number of red blood cells found in the blood stream

2. _____ Females that reproduce sexually versus asexually are said to incur a âtwo-fold cost of sexual reproduction.â Which of the following costs are associated with sexual reproduction for females?

A) MALES! That do-nothing lot really does not directly contribute offspring to the next generation. Females would be better off making all daughters.

B) FEMALES! In most natural settings, those daughters compete with their mothers for potential mates and resources needed to successfully reproduce.

C) MITOSIS! Since sexual reproduction can produce many more offspring than asexual reproduction, there are energetic costs associated with the mitotic divisions required to produce those offspring.

D) MEIOSIS! Every time a gamete is produced, the parent loses a little bit of itself. Half to be precise since only half of its genes are passed on to sexually produced offspring.

E) DIVERSITY! Mothers maximize fitness if all offspring are genetically just like them. Sexual reproduction causes genetic diversity, which ultimately lowers the fitness of both parents.

BIOL 101 Lecture Notes - Lecture 17: Epistasis, Egg Cell, Dihybrid Cross

Document Summary

Get access

Related Documents

BIOL 101 Chapter 11: Study Notes at South Carolina

BIO152H5 Lecture Notes - Lecture 5: Genetic Variation, Ploidy, Multicellular Organism

BIOL 1107 Chapter Notes - Chapter 13: Asexual Reproduction, Somatic Cell, Allele

Related Questions