In birds, sex is determined by a ZW chromosome scheme that is much like the typical XY scheme seen in humans and many other organisms, except that the system is reversed:
Males are ZZ (similar to XX in humans) and females are ZW (similar to XY in humans). A lethal recessive allele that causes death of the embryo occurs on the Z chromosome in pigeons. What would be the sex ratio in the offspring of a cross between a male heterozygous for the lethal allele and a normal female?
A) 1:1 male to female
B) 3:1 male to female
C) 1:2 male to female
D) 2:1 male to female
D
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sequence of the protein. a. polypeptides; nucleotide b. amino acids; allelic c. alleles; amino acid d. nucleotides; amino acid e. amino acids; nucleotide
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Indicate whether the statement is true or false
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Which sequence of classification categories is in the proper order from least to most inclusive?
(a). genus, class, kingdom, domain, order, phylum, species, family (b). domain, class, genus, family, species, order, phylum, kingdom (c). species, genus, family, order, class, phylum, kingdom, domain (d). genus, species, order, class, family, kingdom, domain, phylum (e). species, genus, family, class, order, phylum, kingdom, domain