Mendelian Genetics pt 2

Modern Genetics was first observed by

• Gregor Mendel

• Anton Von Leuwenhock

• Robert Hook

• Theodor Schwann

Sexual reproduction would be more advantageous than asexual reproduction for organisms living in an environment that is diverse and undergoes frequent changes

• Sometimes true

• false

• true

Mendel's work on garden pea plants resulted in the discovery that

• genetic traits of parents always blend together in subsequent generation

• genetic traits are passed down to offspring and traceable in a genotype and sometimes in a phenotype.

• Off spring are always identical to parents' phenotype

• Offspring are never identical to parents' phenotype

The numbers in the figure represent the chromosome number found in each of the dog cells shown below. The processes that are occurring at A and B are_________?

• mitosis and fertilization

• meiosis and fertilization

• mitosis and polination

• meiosis and pollination

Which of the following represents a trait that carries a dominant and recessive allele?

• Genotype

• Homozygous

• phenotype

• heterozygous

in sheep, wire wool (D) is dominant over smooth (d). If two wire-wooled sheep produce a smooth wool lamb, what genotypes are the parents most likely to have?

• Dd and Dd

• DD and Dd

• Dd and dd

• DD and DD

Why are sex-linked disorders more common in males than in females?

• Males have no X chromosome, so none of those genes are expressed.

• The genes on the Y chromosome match the genes on the X chromosome

• Males only have one X chromosome so all genes are expressed

• Males have two X chromosomes so only 50% of genes are expressed

What type of condition is expressed in the picture

• polygenics

• Incomplete dominance

• Co-dominance

• Sex-linkage

Hemophilia is a sex-linked, recessive trait. Which of the following describes the probability of hemophilia in the offspring of a man who does not have hemophilia and a woman whose father is a hemophiliac?

• There is a 50% chance that their daughters will be carriers of Hemophilia

• Each of their sons will have hemophilia

• None of their daughters will have hemophilia

• Their sons have a 25% chance of having hemophila

Hitchhiker's thumb (H) is dominant to no hitchhiker's thumb (h). A woman who does not have hitchhiker's thumb marries a man who is heterozygous for hitchhiker's thumb. What is the probable genotypic ratio of their children?

• 100% Hh: 0% hh

• 75% Hh: 25%hh

• 50% Hh: 50% hh

• 0% Hh: 100% hh