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Biology U5 B

Across
A nitrogen base found in DNA; normally pairs with adenine.
The stage in the first meiotic division where the homologous chromosomes line up as a pair, forming a tetrad of chromatids, at the equator of the cell.
First filial generation; the first generation from a given cross.
The parental generation for a given cross.
The production of haploid male gametes by the male parent.
One member of a pair of homologous chromosomes is present, such as in a gamete.
A five-carbon sugar.
Failure of chromosomes to segregate during the formation of gametes, resulting in extra or a shortage of chromosomes in the gamete.
The combination of phosphate, sugar, and nitrogen bases in DNA or RNA; the combination of three nucleotides codes a specific amino acid.
A hereditary condition for bleeding due to the inability to clot properly.
The ancestral history of an individual; a chart showing the history of a trait in the family.
A nitrogen base found in DNA or RNA; pairs normally with guanine.
The condition in heterozygotes where both members of an allelic pair contribute to phenotype producing a mixture of phenotypic traits.
Down
The stage in the first meiotic division where the doubled chromosomes become visible and nuclear membrane disappears.
A change in the genetic information code.
The stage in the second meiotic division where the chromatid pair lines up at the original cell.
Refers to a pair of genes for a specific trait in an organism which are different.
A nitrogen base found in DNA and RNA; normally pairs with cytosine.
A nitrogen base occurring in DNA and RNA; pairs normally with thymine.
The presence of different genes on the same chromosome.
First leaf or leaves produced from the seed.
Process of development of haploid female gametes.