- In the Z-W system of sex determination, the males are represented as __________, whereas the females are represented as ___________.
- In his classical experiment with white-eyed Drosophila flies, Thomas Hunt Morgan crossed red-eyed (wild-type) females with white-eyed males. He then crossed the red-eyed F1 generation fruit flies with each other and discovered that, while the F2 generation included both red-eyed and white-eyed individuals, _____________.
- What is the inheritance pattern for a trait where all of the daughters and none of the sons of an affected male are affected?
- The end product of egg formation in humans is a large, nutrient-rich ________.
- What accounts for equal expression of genes on the X chromosome in human males and females despite the fact that males and females have an unequal complement of sex chromosomes?
- One form of hereditary deafness is inherited with an X-linked recessive allele. What can be expected for the offspring of a deaf mother and a father with normal hearing?
- A XXY fruit fly can make ________ types of gametes in terms of sex chromosome content.
- In humans, the male is known as the __________ sex, because males can make two types of gametes: one type of sperm carries only the X chromosome, and another type carries the Y chromosome.
- Consider a fruit fly that has two sets of autosomes and a sex chromosome composition XXY. This fly would be a(n) ________.
- When Morgan crossed a white-eyed female fly with a red-eyed male fly, the pattern seen in the progeny was crisscross inheritance. Select the phenotype of the progeny flies.
- Choose the correct statement about the Z-W system of sex determination.
- Drosophila embryos that are XO develop into Blank______.
- When you consider only the sex chromosomes, what types of gametes are produced by a female individual of a species with the XY system of sex determination?
- Which type(s) of chromosomes provide the basis for sex determination in most mammals?
- Drosophila melanogaster has four pairs of chromosomes. Sperm from this species are formed by a meiotic process in which no crossing over occurs. How many genetically different kinds of sperm could be produced by a Drosophila melanogaster male?
- In primroses, the dominant allele of gene K is necessary to synthesize blue flower pigment. Blue pigment synthesis is inhibited by a dominant allele of gene D. In other words, plants with the genotype K- D- will not produce pigment (and their flowers will be white) because of the presence of the D allele. If two dihybrid plants (KkDd) are crossed, how many plants would you EXPECT to need to grow to get 15 blue flowering primrose plants?Note: Put in a number based on the phenotypic ratio.
- The map distance between w and y genes is 1.1 m.u.. A white-eyed (w) yellow bodied (y) female is crossed to a red-eyed, brown-bodied male. The F1 females (red-eyed, brown-bodied) are crossed to males and the F2 male phenotypes are scored. How many of a 2000 progeny would you expect to be white-eyed, brown bodied?
- During oogenesis in humans, cells called _________ __________ are formed from oogonia and undergo meiosis to ultimately form an ovum.
- Fruit flies with one allele for curly wings (Cy) and one allele for normal wings (Cy+) have curly wings. When two curly-winged flies were crossed, 203 curly-winged and 98 normal-winged flies were obtained. In fact, all crosses between curly-winged flies produce nearly the same curly : normal ratio among the progeny. If a curly-winged fly was mated to a normal-winged fly, how many curly-winged flies would you expect among 270 total offspring?
- Place these cells in the correct order in which they are formed during spermatogenesis, starting with the earliest at the top.- Spermatogonia- Sperm cells- Primary spermatocytes- Secondary spermatocytes- Spermatids