Explain why color-blindness is much more common in males than in femalesWhat will be an ideal response?
ANSWER: Color blindness is an X-linked recessive trait. Because males are hemizygous for all genes on
the X chromosome, they express all recessive allele phenotypes for genes on this
chromosome. Therefore, hemizygous males are affected, but only homozygous females are
affected. Stated another way, affected males who receive the mutant allele from their mothers
transmit it to all their daughters but not to any of their sons. However, daughters of affected
males are typically heterozygous and therefore unaffected, but sons of heterozygous females
each have a 50% chance of receiving the recessive gene and being affected. In order for
females to be affected, they must inherit the recessive allele from both parents, while males
only need to inherit the allele from their mother
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Chordata? a. Urochordata b. Hemichordata c. Cephalochordata d. Vertebrata e. Urochordata, Cephalochordata, and Vertebrata
________ is the term that describes how populations change in size
Fill in the blank(s) with correct word
In unwound chromatin, nucleosomes are organized into large coiled loops held together by:
a. histones. b. centromeres. c. kinetochore proteins. d. scaffolding proteins. e. condensins.
The coagulase test is used to distinguish which of the following group of bacteria?
A. Streptococcus pyogenes from Enterococcus faecalis B. Streptococcus pyogenes from Staphylococcus aureus C. Staphylococcus aureus from Staphylococcus epidermidis D. Staphylococcus aureus from Streptococcus pneumoniae